Improve error handling in kernel_config_parser.py
Improve error handling in kernel_config_parser.py

Change-Id: Ife19ed4a56fce149e36ef1dc3f8c20de3533bd6e
Signed-off-by: Michal Przeplata <e7e66087ea2b6f4d3eb01c4545d71a74d74ace14@arm.com>

ARM-software/bob-build,ARM-software/bob-build,ARM-software/bob-build,ARM-software/bob-build,ARM-software/bob-build