Process files with missing DW_AT_name

With current behavior while scanning compile units the utility exits with error if a unit does not contains an entry with name. However, some packages, like arm-trusted-firmware, has entries without names. Since these entries do not provide useful information for the mapping between binaries to sources just skip them.

infrastructure/apertis-issues#81 (closed)

Signed-off-by: Walter Lozano walter.lozano@collabora.com