Fail the command if it has odd number of quotes

src/TJAlien.cxx

@@ -203,6 +203,10 @@ TGridResult *TJAlien::Command(const char *command, bool interactive, UInt_t stre
                 else {
                     opt = Strip(token->GetString().Data(), '\"');
                     append = true;
+                    if (i == tokens->GetEntries() - 1) {
+                        Error("Command", "Invalid command. Check if you miss a matching quote");
+                        return nullptr;
+                    }
                     continue;
                 }
             }
@@ -211,6 +215,10 @@ TGridResult *TJAlien::Command(const char *command, bool interactive, UInt_t stre
                 if (append) {
                     opt.Append(" ");
                     opt.Append(token->GetString().Data());
+                    if (i == tokens->GetEntries() - 1) {
+                        Error("Command", "Invalid command. Check if you miss a matching quote");
+                        return nullptr;
+                    }
                     continue;
                 }
                 else