Update pybind11.h

Author: henryiii

include/pybind11/pybind11.h

@@ -1342,14 +1342,21 @@ class module_ : public object {
         // GraalPy doesn't support PyModule_GetFilenameObject,
         // so getting by attribute (see PR #5584)
         handle this_module = m_ptr;
-        result.attr("__file__") = this_module.attr("__file__");
+        if (hasattr(this_module, "__file__")) {
+            result.attr("__file__") = this_module.attr("__file__");
+        }
 #else
         handle this_file = PyModule_GetFilenameObject(m_ptr);
-        if (!this_file) {
+        if (this_file) {
+            result.attr("__file__") = this_file;
+        }
+        else if (PyErr_ExceptionMatches(PyExc_SystemError) != 0) {
+            PyErr_Clear();
+        }
+        else {
             throw error_already_set();
         }
-        result.attr("__file__") = this_file;
-#endif
+#end
         attr(name) = result;
         return result;
     }