Fix for bug when joining where ID prefixes would be added even if they use the default ID namespace
<!--****************************************************************************
* ConE common properties for building and testing
*
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# ConE version that is added to the produced ZIP file
common.version = 1.2.11
common.build_scripts_dir = build-scripts
document.output =docbuild
build.plugin_package = symbian
cone_python_path = ./source;./source/testautomation;./source/plugins/common/ConeCommandPlugin;./source/plugins/common/ConeLegacyRulePlugin;./source/plugins/common/ConeRulePlugin;./source/plugins/common/ConeTemplatePlugin;./source/plugins/symbian/ConeCRMLPlugin;./source/plugins/common/ConeContentPlugin;./source/plugins/example/ConeExamplePlugin;./source/plugins/symbian/ConeGenconfmlPlugin;./source/plugins/symbian/ConeHCRPlugin;./source/plugins/symbian/ConeProjectConverterPlugin;./source/plugins/symbian/ConeThemePlugin;./source/plugins/symbian/ConeImagePlugin;