[NEXUS-6057] Return null in case of a problem accessing yum config during status rendering

Calling into super.status() triggered a stack overflow

Signed-off-by: Alin Dreghiciu <adreghiciu@gmail.com>
Use try with resources in yum metadata status rendering

Signed-off-by: Alin Dreghiciu <adreghiciu@gmail.com>
Merge pull request #212 from sonatype/NEXUS-6057-stack-overflow-on-yum-capabilities

REVIEW: [NEXUS-6057] Return null in case of a problem accessing yum config during status rendering