RFE - catch exceptions on nonexisting files

[alexxa]

dva -c /etc/validation.yaml validate -i ~/git_projects/dva/data.yaml -o ~/validace.yaml -G content --parallel-tests=10

Traceback (most recent call last):
File "/usr/bin/dva", line 5, in dva -c /etc/validation.yaml validate -i ~/git_projects/dva/data.yaml -o ~/validace.yaml -G content --parallel-tests=10
Traceback (most recent call last):
File "/usr/bin/dva", line 5, in
pkg_resources.run_script('dva==0.5', 'dva')
File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 492, in run_script
self.require(requires)[0].run_script(script_name, ns)
File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 1357, in run_script
exec_(script_code, namespace, namespace)
File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 47, in exec_
exec("""exec code in globs, locs""")
File "", line 1, in
File "/usr/lib/python2.7/site-packages/dva-0.5-py2.7.egg/EGG-INFO/scripts/dva", line 133, in

File "build/bdist.linux-x86_64/egg/aaargh/app.py", line 176, in run
File "/usr/lib/python2.7/site-packages/dva-0.5-py2.7.egg/EGG-INFO/scripts/dva", line 79, in validate

File "build/bdist.linux-x86_64/egg/dva/work/data_parallel_main.py", line 38, in main
File "build/bdist.linux-x86_64/egg/dva/work/data.py", line 177, in load
File "build/bdist.linux-x86_64/egg/dva/work/data.py", line 102, in record_cloud_config
dva.work.data.ConfigError: config /etc/validation.yaml: [Errno 2] No such file or directory: '/etc/validation.yaml'
pkg_resources.run_script('dva==0.5', 'dva')
File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 492, in run_script
self.require(requires)[0].run_script(script_name, ns)
File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 1357, in run_script
exec_(script_code, namespace, namespace)
File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 47, in exec_
exec("""exec code in globs, locs""")
File "", line 1, in
File "/usr/lib/python2.7/site-packages/dva-0.5-py2.7.egg/EGG-INFO/scripts/dva", line 133, in

File "build/bdist.linux-x86_64/egg/aaargh/app.py", line 176, in run
File "/usr/lib/python2.7/site-packages/dva-0.5-py2.7.egg/EGG-INFO/scripts/dva", line 79, in validate

File "build/bdist.linux-x86_64/egg/dva/work/data_parallel_main.py", line 38, in main
File "build/bdist.linux-x86_64/egg/dva/work/data.py", line 177, in load
File "build/bdist.linux-x86_64/egg/dva/work/data.py", line 102, in record_cloud_config
dva.work.data.ConfigError: config /etc/validation.yaml: [Errno 2] No such file or directory: '/etc/validation.yaml'

I believe it's ok to show only line: No such file or directory: '/etc/validation.yaml'