Merge pull request #109 from cs50/develop

disconnecting only if there's a connection

Author: Kareem Zidane

setup.py

@@ -16,5 +16,5 @@
     package_dir={"": "src"},
     packages=["cs50"],
     url="https://github.com/cs50/python-cs50",
-    version="5.0.1"
+    version="5.0.2"
 )

src/cs50/sql.py

@@ -281,7 +281,8 @@ def execute(self, sql, *args, **kwargs):
                 # Disconnect later
                 @flask.current_app.teardown_appcontext
                 def shutdown_session(exception=None):
-                    flask.g._connection.close()
+                    if hasattr(flask.g, "_connection"):
+                        flask.g._connection.close()
 
             # Use this connection
             connection = flask.g._connection