fix #14369 (#14386)

* fix #14369

* empty commit

tests/exception/tcpp_imported_exc2.nim

@@ -0,0 +1,10 @@
+discard """
+targets: "cpp"
+output: ""
+"""
+#issue #14369 case 2
+type RuntimeError {.requiresInit, importcpp: "std::runtime_error", header: "<stdexcept>".} = object
+
+proc initRuntimeError(a: cstring): RuntimeError {.importcpp: "std::runtime_error(@)", constructor.}
+try: raise initRuntimeError("foo2")
+except: discard