Fix log clearing after job restart

In glimmer world rerender doesn't work as before and since we manage log
element manually, we need to also clear it manually and reset the log
properly

app/views/pre.coffee

@@ -62,15 +62,18 @@ View = BasicView.extend
     @teardownLog()
 
   versionDidChange: (->
-    @rerender() if @get('_state') == 'inDOM'
+    this.$('#log').empty()
+    @teardownLog()
+    @createEngine()
   ).observes('log.version')
 
   logDidChange: (->
     console.log 'log view: log did change: rerender' if Log.DEBUG
 
+    this.$('#log').empty()
+    @teardownLog()
     if @get('log')
       @createEngine()
-      @rerender() if @get('_state') == 'inDOM'
   ).observes('log')
 
   teardownLog: ->