propertywatch: Improve error handling

Handle exceptions from the sdbusplus method call API.

A number of method calls are made at application startup.  First the
mapper is queried and then host services directly to obtain initial
values for the property cache.

In either case a missing object is sometimes expected and tolerated
(in a logical sense) without issue.  Eat the new exceptions in these
scenarios and avoid a program crash.

Change-Id: Id79d28b2da997f3c545b86c21932e271e3df8bb3
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
1 file changed