Merge pull request '2296 - Prevent log with no new changes' (#293) from 2297-loggable_empty_logs into dev

Reviewed-by: Carlos Jimenez <carlosjr@verdnatura.es>

loopback/common/models/loggable.js

@@ -259,6 +259,10 @@ module.exports = function(Self) {
         removeUnloggable(definition, oldInstance);
         removeUnloggable(definition, newInstance);
 
+        // Prevent log with no new changes
+        const hasNewChanges = Object.keys(newInstance).length;
+        if (!hasNewChanges) return;
+
         let logRecord = {
             originFk: originId,
             userFk: userFk,