reverted part of "reverted to kotlin 1.0.6"

build.gradle

@@ -33,7 +33,7 @@ subprojects {
     buildscript {
         ext {
             libVersions = [
-                    Kotlin          : '1.0.6',
+                    Kotlin          : '1.1.0',
                     SupportLib      : '25.2.0',
                     MariotakuCommons: '0.9.11',
                     RestFu          : '0.9.35',

twidere/src/main/kotlin/org/mariotaku/twidere/extension/GlideExtensions.kt

@@ -96,7 +96,7 @@ fun RequestManager.loadProfileImage(context: Context, conversation: ParcelableMe
 
 fun RequestManager.loadOriginalProfileImage(context: Context, user: ParcelableUser,
         @ImageShapeStyle shapeStyle: Int = ImageShapeStyle.SHAPE_CIRCLE): DrawableRequestBuilder<String> {
-    val original = user.extras.profile_image_url_original?.let { if (it.isEmpty()) null else it }
+    val original = user.extras.profile_image_url_original?.takeUnless(String::isEmpty)
             ?: Utils.getOriginalTwitterProfileImage(user.profile_image_url)
     return configureLoadProfileImage(context, shapeStyle) { load(original) }
 }

twidere/src/main/kotlin/org/mariotaku/twidere/extension/SharedPreferencesExtensions.kt

@@ -6,5 +6,5 @@ import android.content.SharedPreferences
  * Created by mariotaku on 16/8/25.
  */
 fun SharedPreferences.getNonEmptyString(key: String, def: String): String {
-    return getString(key, def)?.let { if (it.isEmpty()) null else it } ?: def
+    return getString(key, def)?.takeUnless(String::isEmpty) ?: def
 }