N°1123.2 AttributeImage: default_image is no longer mandatory.

SVN:trunk[5036]

setup/compiler.class.inc.php

@@ -1252,6 +1252,11 @@ EOF
 					{
 						$aParameters['default_image'] = "utils::GetAbsoluteUrlModulesRoot().'$sModuleRelativeDir/$sDefault'";
 					}
+					else
+					{
+						// Note: We don't put null as default param value because it would be ignored by the final checks
+						$aParameters['default_image'] = 'null';
+					}
 				}
 				elseif ($sAttType == 'AttributeStopWatch')
 				{