Merge branch 'backport-3753-gdb-plugin-glib-2-78' into 'glib-2-78'

Backport !3753 “gobject_gdb.py: Do not break bt on optimized build” to glib-2-78

See merge request GNOME/glib!3759

gobject/gobject_gdb.py

@@ -148,11 +148,16 @@ def get_signal_name(id):
     id = long(id)
     if id == 0:
         return None
+
+    try:
         val = read_global_var("g_signal_nodes")
         max_s = read_global_var("g_n_signal_nodes")
         max_s = long(max_s)
         if id < max_s:
             return val[id]["name"].string()
+    except gdb.error:
+        return None
+
     return None