fixed possible NPE

build.gradle

@@ -58,7 +58,8 @@ subprojects {
                     MultiValueSwitch  : '0.9.8',
                     PickNCrop         : '0.9.24',
                     AndroidGIFDrawable: '1.2.6',
-                    KPreferences      : '0.9.6'
+                    KPreferences      : '0.9.6',
+                    Kovenant          : '3.3.0'
             ]
         }
 

twidere/build.gradle

@@ -189,10 +189,10 @@ dependencies {
     compile 'com.github.mariotaku:Chameleon:0.9.16'
 
     compile "org.jetbrains.kotlin:kotlin-stdlib:${libVersions['Kotlin']}"
-    compile 'nl.komponents.kovenant:kovenant:3.3.0'
-    compile 'nl.komponents.kovenant:kovenant-android:3.3.0'
-    compile 'nl.komponents.kovenant:kovenant-functional:3.3.0'
-    compile 'nl.komponents.kovenant:kovenant-combine:3.3.0'
+    compile "nl.komponents.kovenant:kovenant:${libVersions['Kovenant']}"
+    compile "nl.komponents.kovenant:kovenant-android:${libVersions['Kovenant']}"
+    compile "nl.komponents.kovenant:kovenant-functional:${libVersions['Kovenant']}"
+    compile "nl.komponents.kovenant:kovenant-combine:${libVersions['Kovenant']}"
 }
 
 task svgToDrawable(type: SvgDrawableTask) {

twidere/src/main/kotlin/org/mariotaku/twidere/task/twitter/message/GetMessagesTask.kt

@@ -214,7 +214,7 @@ class GetMessagesTask(
                     maxId(maxId)
                 }
             }).userInbox
-        }
+        } ?: throw MicroBlogException("Null response data")
         return createDatabaseUpdateData(context, details, response, profileImageSize)
     }
 

twidere/src/main/res/layout/activity_browser_sign_in.xml

@@ -20,7 +20,6 @@
 
 <RelativeLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
     android:layout_height="match_parent">