diff --git a/.circleci/config.yml b/.circleci/config.yml
index ef2b3d17..1fdd775d 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -125,7 +125,6 @@ workflows:
             branches:
               only:
                 - develop
-                - master
       - generate_signed_apk:
           filters:
             tags:
diff --git a/ultrasonic/src/main/res/drawable/ic_empty.xml b/ultrasonic/src/main/res/drawable/ic_empty.xml
index 74776517..5e7c170a 100644
--- a/ultrasonic/src/main/res/drawable/ic_empty.xml
+++ b/ultrasonic/src/main/res/drawable/ic_empty.xml
@@ -1,91 +1,10 @@
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     android:width="24dp"
     android:height="24dp"
-    android:viewportWidth="100"
-    android:viewportHeight="100"
+    android:viewportWidth="24"
+    android:viewportHeight="24"
     android:tint="?attr/colorControlNormal">
-    <path
-        android:fillColor="#000000"
-        android:pathData="M90.365,48.085l-3.83,0l-3.859,0l-3.83,0l-3.86,0l-3.83,0l-3.86,0l0,3.86l3.86,0l3.83,0l3.86,0l3.83,0l3.859,0l3.83,0l3.861,0l0,-3.86z" />
-    <path
-        android:fillColor="#000000"
-        android:pathData="M82.676,82.705h3.859v3.83h-3.859z" />
-    <path
-        android:fillColor="#000000"
-        android:pathData="M82.676,13.465h3.859v3.86h-3.859z" />
-    <path
-        android:fillColor="#000000"
-        android:pathData="M78.846,78.846h3.83v3.859h-3.83z" />
-    <path
-        android:fillColor="#000000"
-        android:pathData="M78.846,17.325h3.83v3.83h-3.83z" />
-    <path
-        android:fillColor="#000000"
-        android:pathData="M74.986,75.016h3.859v3.83h-3.859z" />
-    <path
-        android:fillColor="#000000"
-        android:pathData="M74.986,21.155h3.859v3.86h-3.859z" />
-    <path
-        android:fillColor="#000000"
-        android:pathData="M71.156,71.154h3.83v3.861h-3.83z" />
-    <path
-        android:fillColor="#000000"
-        android:pathData="M71.156,25.015h3.83v3.83h-3.83z" />
-    <path
-        android:fillColor="#000000"
-        android:pathData="M67.296,67.324h3.86v3.83h-3.86z" />
-    <path
-        android:fillColor="#000000"
-        android:pathData="M67.296,28.845h3.86v3.86h-3.86z" />
-    <path
-        android:fillColor="#000000"
-        android:pathData="M63.466,63.465h3.83v3.859h-3.83z" />
-    <path
-        android:fillColor="#000000"
-        android:pathData="M63.466,32.705h3.83v3.83h-3.83z" />
-    <path
-        android:fillColor="#000000"
-        android:pathData="M48.056,71.154l0,3.862l0,3.83l0,3.859l0,3.83l0,3.86l0,3.83l3.86,0l0,-3.83l0,-3.86l0,-3.83l0,-3.859l0,-3.83l0,-3.862l0,-3.83l-3.86,0z" />
-    <path
-        android:fillColor="#000000"
-        android:pathData="M48.056,9.635l0,3.83l0,3.86l0,3.83l0,3.86l0,3.83l0,3.86l3.86,0l0,-3.86l0,-3.83l0,-3.86l0,-3.83l0,-3.86l0,-3.83l0,-3.86l-3.86,0z" />
-    <path
-        android:fillColor="#000000"
-        android:pathData="M32.676,63.465h3.859v3.859h-3.859z" />
-    <path
-        android:fillColor="#000000"
-        android:pathData="M32.676,32.705h3.859v3.83h-3.859z" />
-    <path
-        android:fillColor="#000000"
-        android:pathData="M28.846,67.324h3.83v3.83h-3.83z" />
-    <path
-        android:fillColor="#000000"
-        android:pathData="M28.846,28.845h3.83v3.86h-3.83z" />
-    <path
-        android:fillColor="#000000"
-        android:pathData="M24.986,71.154h3.859v3.861h-3.859z" />
-    <path
-        android:fillColor="#000000"
-        android:pathData="M24.986,25.015h3.859v3.83h-3.859z" />
-    <path
-        android:fillColor="#000000"
-        android:pathData="M21.156,75.016h3.83v3.83h-3.83z" />
-    <path
-        android:fillColor="#000000"
-        android:pathData="M21.156,21.155h3.83v3.86h-3.83z" />
-    <path
-        android:fillColor="#000000"
-        android:pathData="M17.296,78.846h3.86v3.859h-3.86z" />
-    <path
-        android:fillColor="#000000"
-        android:pathData="M17.296,17.325h3.86v3.83h-3.86z" />
-    <path
-        android:fillColor="#000000"
-        android:pathData="M13.466,82.705h3.83v3.83h-3.83z" />
-    <path
-        android:fillColor="#000000"
-        android:pathData="M17.296,51.945l3.86,0l3.83,0l3.86,0l3.83,0l0,-3.86l-3.83,0l-3.86,0l-3.83,0l-3.86,0l-3.83,0l-3.861,0l-3.83,0l0,3.86l3.83,0l3.861,0z" />
-    <path
-        android:fillColor="#000000"
-        android:pathData="M13.466,13.465h3.83v3.86h-3.83z" />
+  <path
+      android:fillColor="@android:color/white"
+      android:pathData="M7,11L1,11v2h6v-2zM9.17,7.76L7.05,5.64 5.64,7.05l2.12,2.12 1.41,-1.41zM13,1h-2v6h2L13,1zM18.36,7.05l-1.41,-1.41 -2.12,2.12 1.41,1.41 2.12,-2.12zM17,11v2h6v-2h-6zM14.83,16.24l2.12,2.12 1.41,-1.41 -2.12,-2.12 -1.41,1.41zM5.64,16.95l1.41,1.41 2.12,-2.12 -1.41,-1.41 -2.12,2.12zM11,23h2v-6h-2v6z"/>
 </vector>