Added error regarding empty gist content

gist.py

@@ -140,6 +140,11 @@ def _fn(*args, **kwargs):
 
 
 def create_gist(public, description, files):
+    for filename, text in list(files.items()):
+        if not text:
+            sublime.error_message("Gist: Unable to create a Gist with empty content")
+            return
+
     file_data = dict((filename, {'content': text}) for filename, text in list(files.items()))
     data = json.dumps({'description': description, 'public': public, 'files': file_data})
     gist = api_request(GISTS_URL, data)
@@ -437,6 +442,9 @@ def on_gist_filename(filename):
 
                 gist = create_gist(self.public, description, gist_data)
 
+                if not gist:
+                    return
+
                 gist_html_url = gist['html_url']
                 sublime.set_clipboard(gist_html_url)
                 sublime.status_message("%s Gist: %s" % (self.mode(), gist_html_url))