Mirror the check already being done in the other fragment. As reported
via ACRA:
ANDROID_VERSION=4.4.4
APP_VERSION_NAME=0.100-alpha6
STACK_TRACE=java.lang.NullPointerException
at org.fdroid.fdroid.AppDetails$AppDetailsHeaderFragment.updateViews(AppDetails.java:1524)
at org.fdroid.fdroid.AppDetails$AppDetailsHeaderFragment.updateViews(AppDetails.java:1519)
at org.fdroid.fdroid.AppDetails.refreshHeader(AppDetails.java:624)
at org.fdroid.fdroid.AppDetails.onAppChanged(AppDetails.java:549)
at org.fdroid.fdroid.AppDetails.access$000(AppDetails.java:100)
at org.fdroid.fdroid.AppDetails$AppObserver.onChange(AppDetails.java:141)
at android.database.ContentObserver$NotificationRunnable.run(ContentObserver.java:180)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5146)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:732)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:566)
at dalvik.system.NativeStart.main(Native Method)
d847f2caef