Use @catch_config_error to catch exception from getcwdu in nonexisting directory

IPython/core/application.py

@@ -144,6 +144,7 b' class BaseIPythonApplication(Application):'
     # The class to use as the crash handler.
     crash_handler_class = Type(crashhandler.CrashHandler)
 
+    @catch_config_error
     def __init__(self, **kwargs):
         super(BaseIPythonApplication, self).__init__(**kwargs)
         # ensure current working directory exists

IPython/parallel/scripts/ipcluster

@@ -11,15 +11,6 b''
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
-import sys
-import traceback
-
 from IPython.parallel.apps.ipclusterapp import launch_new_instance
 
-try:
     launch_new_instance()
-except:
-    exc_type, exc_value, exc_traceback = sys.exc_info()
-    traceback.print_exception(exc_type, exc_value, exc_traceback,
-                              file=sys.stderr)
-    sys.exit(1)

IPython/parallel/scripts/ipcontroller

@@ -11,15 +11,6 b''
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
-import sys
-import traceback
-
 from IPython.parallel.apps.ipcontrollerapp import launch_new_instance
 
-try:
     launch_new_instance()
-except:
-    exc_type, exc_value, exc_traceback = sys.exc_info()
-    traceback.print_exception(exc_type, exc_value, exc_traceback,
-                              file=sys.stderr)
-    sys.exit(1)

IPython/parallel/scripts/ipengine

@@ -11,15 +11,6 b''
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
-import sys
-import traceback
-
 from IPython.parallel.apps.ipengineapp import launch_new_instance
 
-try:
     launch_new_instance()
-except:
-    exc_type, exc_value, exc_traceback = sys.exc_info()
-    traceback.print_exception(exc_type, exc_value, exc_traceback,
-                              file=sys.stderr)
-    sys.exit(1)

IPython/parallel/scripts/iplogger

@@ -11,15 +11,6 b''
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
-import sys
-import traceback
-
 from IPython.parallel.apps.iploggerapp import launch_new_instance
 
-try:
     launch_new_instance()
-except:
-    exc_type, exc_value, exc_traceback = sys.exc_info()
-    traceback.print_exception(exc_type, exc_value, exc_traceback,
-                              file=sys.stderr)
-    sys.exit(1)

IPython/scripts/ipython

@@ -1,15 +1,7 b''
 #!/usr/bin/env python
 """Terminal-based IPython entry point.
 """
-import sys
-import traceback
 
 from IPython.frontend.terminal.ipapp import launch_new_instance
 
-try:
     launch_new_instance()
-except:
-    exc_type, exc_value, exc_traceback = sys.exc_info()
-    traceback.print_exception(exc_type, exc_value, exc_traceback,
-                              file=sys.stderr)
-    sys.exit(1)