Add debugging.

app.py

@@ -253,7 +253,9 @@ def html_to_png(card_name, html):
         css = ['./css/mana.css', './css/keyrune.css',
                './css/mtg_custom.css']
         imgkit.from_string(html, path, {"xvfb": ""}, css=css)
-    except:
+    except Exception as e:
+        print("ImgKit Error:")
+        print(e)
         try:
             # For Windows local, requires 'html2image' package from pip.
             from html2image import Html2Image