Catch error in condition evaluation

And return a better message to users

weboob/tools/application/base.py

@@ -33,6 +33,7 @@ from weboob.core.backendscfg import BackendsConfig
 from weboob.tools.config.iconfig import ConfigError
 from weboob.tools.log import createColoredFormatter, getLogger
 from weboob.tools.misc import to_unicode
+from .results import ResultsConditionError
 
 __all__ = ['BaseApplication']
 
@@ -439,5 +440,8 @@ class BaseApplication(object):
             except CallErrors as e:
                 app.bcall_errors_handler(e)
                 sys.exit(1)
+            except ResultsConditionError as e:
+                print >>sys.stderr, '%s' % e
+                sys.exit(1)
         finally:
             app.deinit()