[uss_qualifier] Fix unchecked message field access
#1065
Merged
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In an off-nominal condition where a USS fails to clear an area via the flight planning interface, and also does not specify the optional
messagefield, uss_qualifier will attempt to access the non-existentmessagefield and raise an exception. This problem was observed in the US UTM Implementation. This PR fixes that issue by checking for the existence of themessagefield before accessing it.