virsh: re-fix help printing without connection

Re-do 0217089b so it does not add regression for commit c0726e07 that allowed to
print help without making a connection to the daemon.

tools/virsh.c

@@ -962,14 +962,16 @@ main(int argc, char **argv)
     if (!vshInit(ctl, cmdGroups, NULL))
         exit(EXIT_FAILURE);
 
-    ctl->connname = vshStrdup(ctl, virGetEnvBlockSUID("VIRSH_DEFAULT_CONNECT_URI"));
-
     if (!virshParseArgv(ctl, argc, argv) ||
         !virshInit(ctl)) {
         virshDeinit(ctl);
         exit(EXIT_FAILURE);
     }
 
+    if (!ctl->connname)
+        ctl->connname = vshStrdup(ctl,
+                                  virGetEnvBlockSUID("VIRSH_DEFAULT_CONNECT_URI"));
+
     if (!ctl->imode) {
         ret = vshCommandRun(ctl, ctl->cmd);
     } else {