bug in variable non None check (#375)

Author: svyotov

atlassian/confluence.py

@@ -122,7 +122,7 @@ def get_page_by_title(self, space, title, start=None, limit=None):
             params['limit'] = int(limit)
         if space is not None:
             params['spaceKey'] = str(space)
-        if space is not None:
+        if title is not None:
             params['title'] = str(title)
         try:
             return (self.get(url, params=params) or {}).get('results')[0]