changed migration number 49 to 51 for skip-if-empty, removed comment

resources/migrations/049_add_pulse_skip_if_empty.yaml → resources/migrations/051_add_pulse_skip_if_empty.yaml

 databaseChangeLog:
   - changeSet:
-      id: 49
+      id: 51
       author: tlrobinson
       changes:
-        ######################################## add skip_if_empty column to pulse ########################################
         - addColumn:
             tableName: pulse
             columns: