Use === when testing for empty value and setting defaults

web/includes/Object.php

@@ -206,7 +206,8 @@ class ZM_Object {
           }
         }
       } # end foreach default
-    }
+    } # end if defaults
+
     foreach ( $new_values as $field => $value ) {
 
       if ( method_exists($this, $field) ) {
@@ -281,7 +282,7 @@ class ZM_Object {
     # Set defaults.  Note that we only replace "" with null, not other values
     # because for example if we want to clear TimestampFormat, we clear it, but the default is a string value
     foreach ( $this->defaults as $field => $default ) {
-      if ( (!property_exists($this, $field)) or ($this->{$field} == '') ) {
+      if ( (!property_exists($this, $field)) or ($this->{$field} === '') ) {
         if ( is_array($default) ) {
           $this->{$field} = $default['default'];
         } else if ( $default == null ) {