Fix panic when using MySQL for events storage and no table created yet

CHANGELOG.md

@@ -1,8 +1,12 @@
 ## Changelog
 
+### 0.7.1 (2018-07-18)
+
+* Fix panic when using MySQL for events storage and no table created yet.
+
 ### 0.7 (2018-07-04)
 
-* When using MySQL for event storage, do not leak connections.
+* When using MySQL for events storage, do not leak connections.
 * Last events were not shown when viewing a repo of non-default namespace.
 * Support repos with slash in the name.
 * Enable Sonatype Nexus compatibility.

README.md

@@ -77,6 +77,12 @@ You can create a table manually if you don't want to grant `CREATE` permission:
 
 ### Schedule a cron task for purging tags
 
+To delete tags you need to enable the corresponding option in Docker Registry config. For example:
+
+    storage:
+      delete:
+        enabled: true
+
 The following example shows how to run a cron task to purge tags older than X days but also keep
 at least Y tags no matter how old. Assuming container has been already running.
 

events/event_listener.go

@@ -175,7 +175,9 @@ func (e *EventListener) getDababaseHandler() (*sql.DB, error) {
 		if err != nil {
 			firstRun = true
 		}
-		rows.Close()
+		if rows != nil {
+			rows.Close()
+		}
 	}
 
 	// Create table on first run.