Fixed the crash during default Fabric initialization for external contributors

android/src/com/mapswithme/maps/MwmApplication.java

@@ -100,6 +100,11 @@ public class MwmApplication extends Application
     return sSelf.mPrefs;
   }
 
+  private static boolean isCrashlyticsEnabled()
+  {
+    return !BuildConfig.FABRIC_API_KEY.startsWith("0000");
+  }
+
   @SuppressWarnings("ResultOfMethodCallIgnored")
   @Override
   public void onCreate()
@@ -189,7 +194,7 @@ public class MwmApplication extends Application
 
   private void initCrashlytics()
   {
-    if (BuildConfig.FABRIC_API_KEY.startsWith("0000"))
+    if (!isCrashlyticsEnabled())
       return;
 
     Fabric.with(this, new Crashlytics(), new CrashlyticsNdk());
@@ -199,6 +204,9 @@ public class MwmApplication extends Application
 
   private static boolean setInstallationIdToCrashlytics()
   {
+    if (!isCrashlyticsEnabled())
+      return false;
+
     final String installationId = Utils.getInstallationId();
     // If installation id is not found this means id was not
     // generated by alohalytics yet and it is a first run.