[net] Prevent a trailing question mark when no options are specified

So that constructor error "file does not exist" does not show a suspicious question mark

Author: ferdymercury

net/net/src/TWebFile.cxx

@@ -327,8 +327,10 @@ void TWebFile::SetMsgReadBuffer10(const char *redirectLocation, Bool_t tempRedir
       fBasicUrl += fUrl.GetPort();
       fBasicUrl += "/";
       fBasicUrl += fUrl.GetFile();
-      fBasicUrl += "?";
-      fBasicUrl += fUrl.GetOptions();
+      if (strlen(fUrl.GetOptions())) {
+         fBasicUrl += "?";
+         fBasicUrl += fUrl.GetOptions();
+      }
    }
 
    if (fMsgReadBuffer10 == "") {