Descriptor: can't find vendor during system component compilation

issue:https://gitee.com/openharmony/build/issues/I6CDFX?from=project-issueSigned-off-by: Nlwx1153805 <longshining2@huawei.com>

hb_internal/common/config.py

@@ -292,7 +292,7 @@ class Config(metaclass=Singleton):
     def vendor_path(self):
         _vendor_path = os.path.join(self.root_path, 'vendor')
         if not os.path.isdir(_vendor_path):
-            raise OHOSException(f'Invalid vendor path: {_vendor_path}')
+            _vendor_path = ''
         return _vendor_path
 
     @property

hb_internal/common/product.py

@@ -83,6 +83,7 @@ class Product():
                                     'config': config_path,
                                     'component_type': info.get('component_type', '')
                                 }
+        if config.vendor_path != '':
             for company in os.listdir(config.vendor_path):
                 company_path = os.path.join(config.vendor_path, company)
                 if not os.path.isdir(company_path):