Merge pull request #6 in ZP/z-push from bugfix/ZP-640-sync-object-comparison-should-not to develop

* commit 'e070d653':
  First check if neither object has the array property set, and if that is the case log it at debug level and continue with the comparison of other properties.

(cherry picked from commit 08bf61c6)

src/lib/syncobjects/syncobject.php

@@ -129,8 +129,13 @@ abstract class SyncObject extends Streamer {
             $val = $v[self::STREAMER_VAR];
             // array of values?
             if (isset($v[self::STREAMER_ARRAY])) {
-                // seek for differences in the arrays
-                if (is_array($this->$val) && is_array($odo->$val)) {
+                // if neither array is created then don't fail the comparison
+                if (!isset($this->$val) && !isset($odo->$val)) {
+                    ZLog::Write(LOGLEVEL_DEBUG, sprintf("SyncObject->equals() array '%s' is NOT SET in either object", $val));
+                    continue;
+                }
+                elseif (is_array($this->$val) && is_array($odo->$val)) {
+                    // if both arrays exist then seek for differences in the arrays
                     if (count(array_diff($this->$val, $odo->$val)) + count(array_diff($odo->$val, $this->$val)) > 0) {
                         ZLog::Write(LOGLEVEL_DEBUG, sprintf("SyncObject->equals() items in array '%s' differ", $val));
                         return false;