Re #149 - allow empty timestamp limit for scrub operation

backend/__init__.py

@@ -299,7 +299,10 @@ def changedetection_app(config=None, datastore_o=None):
         if request.method == 'POST':
             confirmtext = request.form.get('confirmtext')
             limit_date = request.form.get('limit_date')
+            limit_timestamp = 0
 
+            # Re #149 - allow empty/0 timestamp limit
+            if len(limit_date):
                 try:
                     limit_date = limit_date.replace('T', ' ')
                     # I noticed chrome will show '/' but actually submit '-'