Check that the file exists before proceeding

screenshot

@@ -35,21 +35,24 @@ path = config.get('GtkGrab','capPath')
 
 os.system(command.replace("%s", path))
 
-# encode the screenshot with base64
-data = base64.b64encode(open(path, 'r').read())
-
-# hash the data with the user's secret token and send that as header
-hash = hashlib.sha1()
-
-hash.update(data)
-hash.update(token)
-
-headers = {'X-Username': user, 'X-Signature': hash.hexdigest(), 'Content-Type': 'text/xml'}
-
-# upload the url and give the screenshot url to the user
-url = urllib2.urlopen(urllib2.Request(postURL, data, headers)).read();
-os.remove(path)
-
-pyperclip.copy(url)
-
-os.system(notifyCommand.replace('%s', url))
+# validate the command was successful and a file was saved
+if os.path.isfile(path):
+
+    # encode the screenshot with base64
+    data = base64.b64encode(open(path, 'r').read())
+
+    # hash the data with the user's secret token and send that as header
+    hash = hashlib.sha1()
+
+    hash.update(data)
+    hash.update(token)
+
+    headers = {'X-Username': user, 'X-Signature': hash.hexdigest(), 'Content-Type': 'text/xml'}
+
+    # upload the url and give the screenshot url to the user
+    url = urllib2.urlopen(urllib2.Request(postURL, data, headers)).read();
+    os.remove(path)
+
+    pyperclip.copy(url)
+
+    os.system(notifyCommand.replace('%s', url))