[PATCH] fix usage of dbus_error_is_set in libhal

[Danny Kukawka]

Hi,

this patch fixes the usage of dbus_error_is_set(error) if the error is NULL. 
Added check to be sure the lib don't call dbus_error_is_set() if the error is 
NULL, otherwise the call crash.

Cheers,

Danny

 libhal.c | 40 ++++++++++++++++++++--------------------
 1 file changed, 20 insertions(+), 20 deletions(-)
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