[vala/684-remove-field-context-from-symbolresolver] vala: added test for non-null set to null local variable

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit 934b28ae0e2d6f6b60ba1f6927007fe932fdb83f
Author: Daniel Espinosa <esodan gmail com>
Date:   Tue Oct 16 13:57:11 2018 -0500

    vala: added test for non-null set to null local variable

 tests/nullability/bug611223.vala | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/tests/nullability/bug611223.vala b/tests/nullability/bug611223.vala
index 9fbf30c07..3d054e58f 100644
--- a/tests/nullability/bug611223.vala
+++ b/tests/nullability/bug611223.vala
@@ -4,4 +4,5 @@ void main() {
        string? some_null = nullable ?? null;
        string also_non_null = null ?? non_null;
        string really_non_null = non_null ?? nullable;
+       string str = null; // Local Variables as Reference type, can be nullable
 }