make the parser 2 pass system

- first run parser with --download
- then run the exif script
- finally run parser without any flags

parser.cc

@@ -137,6 +137,7 @@ int main(int argc, char **argv)
           if (subjv.IsArray()) {
             for (auto i = 0; i<subjv.GetArray().Size(); i++) {
               subjects += subjv[i].GetString();
+              subjects += " ";
             }
             std::replace( description.begin(), description.end(), ',', ':'); 
             std::replace( description.begin(), description.end(), '\n', ' ');
@@ -175,6 +176,7 @@ int main(int argc, char **argv)
           }
         }
 
+        if (!download_mode) {
           if (is_cc_license) {
             char exif_file[128];
             snprintf(exif_file, sizeof exif_file, "%s-%s.jpeg.exif.json", article_id.c_str(), mediaid.c_str());
@@ -254,6 +256,7 @@ int main(int argc, char **argv)
         }
       }
     }
+  }
   out_file1.close();   
   return 0;
 }