Signals with nullable string parameter cause runtime error
@ricotz
Submitted by Rico Tzschichholz Link to original bug (#793007)
Description
This triggers an issue in GVariantModule where g_variant_new_string() will be used with a null-string which is not allowed.
g_variant_new_string: string must be valid UTF-8, and must not be NULL. To encode potentially-NULL strings, use g_variant_new() with ms as the format string.
Version: 0.39.x