missing image key should fallback to the image name

If the image key isn’t actually mapped to anything, then just assume
the key is the image name.

Author: jrapoport

AWLThemeManager/AWLThemeManager.m

@@ -131,6 +131,9 @@ - (UIImage *)imageforKey:(NSString *)key forTheme:(NSString*)themeName
 
     NSString *imageName = [self objectForKey:key forTheme:themeName];
 
+    if (imageName == nil) {
+        imageName = key;
+    }    
     return [self imageNamed:imageName forTheme:themeName];
 }