Fix bugs when image width/height are null

app/models/post.rb

@@ -137,7 +137,7 @@ class Post < ActiveRecord::Base
     end
 
     def has_dimensions?
-      is_image? || is_flash? || is_video?
+      image_width.present? && image_height.present?
     end
   end
 
@@ -508,6 +508,7 @@ class Post < ActiveRecord::Base
 
       tags -= %w(incredibly_absurdres absurdres highres lowres huge_filesize)
 
+      if has_dimensions?
         if image_width >= 10_000 || image_height >= 10_000
           tags << "incredibly_absurdres"
         end
@@ -521,15 +522,16 @@ class Post < ActiveRecord::Base
           tags << "lowres"
         end
 
-      if file_size >= 10.megabytes
-        tags << "huge_filesize"
-      end
-
         if image_width >= 1024 && image_width.to_f / image_height >= 4
           tags << "wide_image long_image"
         elsif image_height >= 1024 && image_height.to_f / image_width >= 4
           tags << "tall_image long_image"
         end
+      end
+
+      if file_size >= 10.megabytes
+        tags << "huge_filesize"
+      end
 
       return tags
     end