Bug 163018 An error extension will lead the report contain chart can't be opened and can not new a report.
Details: An error extension will lead the report contain chart can't open In org.eclipse.birt.report.tests.model has an error extension. When run the birt use workbenck, the report contain chart can't be opened and it can not new a report.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/metadata/EncryptionHelperExtensionLoader.java
}
				MetaDataDictionary.getInstance( ).setEncryptionHelper( helper );
			}
			catch ( FrameworkException e )
			{
				throw new ExtensionException(
						new String[]{className},
						ExtensionException.DESIGN_EXCEPTION_FAILED_TO_CREATE_INSTANCE );
			}
		}
		/**
		 * Checks whether the required attribute is set.
		 * 
		 * @param name
		 *            the required attribute name
		 * @param value
		 *            the attribute value
		 * @throws ExtensionException
		 *             if the value is empty
		 */
		void checkRequiredAttribute( String name, String value )
				throws ExtensionException
		{
			if ( StringUtil.isBlank( value ) )
				throw new ExtensionException( new String[]{name},
						ExtensionException.DESIGN_EXCEPTION_VALUE_REQUIRED );
		}
	}
}