Client eats important tracebacks

```
DEBUG 2015-05-18 23:38:19,053: Executing command: 'submit'
DEBUG 2015-05-18 23:38:19,053: Found CRAB cache file /home/meloam/.crab3
DEBUG 2015-05-18 23:38:19,063: Checking credentials
DEBUG 2015-05-18 23:38:19,064: Found proxy file /tmp/x509up_u112870
DEBUG 2015-05-18 23:38:19,064: Getting proxy life time left
DEBUG 2015-05-18 23:38:19,166: Executing :
command : voms-proxy-info -file /tmp/x509up_u112870 -timeleft
output : 85755

error:
retcode : 0
DEBUG 2015-05-18 23:38:19,268: Executing :
command : voms-proxy-info -file /tmp/x509up_u112870 -actimeleft
output : 85755

error:
retcode : 0
DEBUG 2015-05-18 23:38:19,268: Proxy valid for 23:49:15 hours
INFO 2015-05-18 23:38:19,268: Will use CRAB configuration file crab.py
DEBUG 2015-05-18 23:38:19,268: Loading CRAB configuration file.
ERROR 2015-05-18 23:38:19,271: Syntax error in CRAB configuration file:
'NoneType' object has no attribute 'endswith'
Please refer to https://twiki.cern.ch/twiki/bin/view/CMSPublic/CRAB3CommonErrors#Syntax_error_in_CRAB_configurati
See the ./crab.log file for more details.
The documentation about the CRAB configuration file can be found in https://twiki.cern.ch/twiki/bin/view/CMSPublic/CRAB3ConfigurationFile
ERROR 2015-05-18 23:38:19,271: Caught exception
Traceback (most recent call last):
File "/gpfs22/home/meloam/projects/bsm-edntuple/me2/src/BSM3GAna/EDMNtuple/CRABClient/src/python/CRABClient/CRABCommandLine.py", line 139, in
client()
File "/gpfs22/home/meloam/projects/bsm-edntuple/me2/src/BSM3GAna/EDMNtuple/CRABClient/src/python/CRABClient/CRABCommandLine.py", line 124, in __call__
self.cmd = sub_cmd(self.logger, args[1:])
File "/home/meloam/projects/bsm-edntuple/me2/src/BSM3GAna/EDMNtuple/CRABClient/src/python/CRABClient/Commands/submit.py", line 39, in __init__
SubCommand.__init__(self, logger, cmdargs, disable_interspersed_args = True)
File "/home/meloam/projects/bsm-edntuple/me2/src/BSM3GAna/EDMNtuple/CRABClient/src/python/CRABClient/Commands/SubCommand.py", line 290, in __init__
self.loadConfig(self.options.config, self.args)
File "/home/meloam/projects/bsm-edntuple/me2/src/BSM3GAna/EDMNtuple/CRABClient/src/python/CRABClient/Commands/SubCommand.py", line 83, in loadConfig
raise ConfigurationException(configmsg)
ConfigurationException: Syntax error in CRAB configuration file:
'NoneType' object has no attribute 'endswith'
Please refer to https://twiki.cern.ch/twiki/bin/view/CMSPublic/CRAB3CommonErrors#Syntax_error_in_CRAB_configurati
See the ./crab.log file for more details.
The documentation about the CRAB configuration file can be found in https://twiki.cern.ch/twiki/bin/view/CMSPublic/CRAB3ConfigurationFile
```

Reraising a new exception blows away the context that would be needed to fix the problem. Who was set to NoneType??