Added fail-safe

app/src/main/java/eu/faircode/email/EmailProvider.java

@@ -322,6 +322,7 @@ public class EmailProvider implements Parcelable {
     }
 
     static EmailProvider getProvider(Context context, String id) throws FileNotFoundException {
+        if (id != null)
             for (EmailProvider provider : loadProfiles(context))
                 if (id.equals(provider.id))
                     return provider;