[gjs: 4/9] fundamental: Deal with missing introspection info

[Cosimo Cecchi <cosimoc src gnome org>]

commit 8ece7eb3a9df74ecc1232454167e7537f75a7903
Author: Philip Chimento <philip endlessm com>
Date:   Tue Aug 27 11:47:09 2019 +0300

    fundamental: Deal with missing introspection info
    
    It's possible to have a fundamental type that isn't exposed to GObject
    introspection and so has no introspection info. In that case, we should
    assume that it has 0 constructor arguments since there's no other way to
    tell.
    
    This case would otherwise log a critical.

 gi/fundamental.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
---
diff --git a/gi/fundamental.cpp b/gi/fundamental.cpp
index da8f5a08..42568498 100644
--- a/gi/fundamental.cpp
+++ b/gi/fundamental.cpp
@@ -385,7 +385,9 @@ bool FundamentalPrototype::get_parent_proto(
 
 // Overrides GIWrapperPrototype::constructor_nargs().
 unsigned FundamentalPrototype::constructor_nargs(void) const {
-    return g_callable_info_get_n_args(m_constructor_info);
+    if (m_constructor_info)
+        return g_callable_info_get_n_args(m_constructor_info);
+    return 0;
 }
 
 /*