fix usage of logger before it is initialized (fix ros#490)

tools/roslaunch/CHANGELOG.rst

@@ -2,6 +2,10 @@
 Changelog for package roslaunch
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
+Forthcoming
+-----------
+* fix usage of logger before it is initialized (`#490 <https://github.com/ros/ros_comm/issues/490>`_) (regression from 1.11.6)
+
 1.11.8 (2014-08-04)
 -------------------
 * remove implicit rostest dependency and use rosunit instead (`#475 <https://github.com/ros/ros_comm/issues/475>`_)

tools/roslaunch/src/roslaunch/__init__.py

@@ -208,6 +208,7 @@ def _validate_args(parser, options, args):
 
 def main(argv=sys.argv):
     options = None
+    logger = None
     try:
         from . import rlutil
         parser = _get_optparse()
@@ -305,13 +306,15 @@ def main(argv=sys.argv):
     except RLException as e:
         roslaunch_core.printerrlog(str(e))
         roslaunch_core.printerrlog('The traceback for the exception was written to the log file')
-        logger.error(traceback.format_exc())
+        if logger:
+            logger.error(traceback.format_exc())
         sys.exit(1)
     except ValueError as e:
         # TODO: need to trap better than this high-level trap
         roslaunch_core.printerrlog(str(e))
         roslaunch_core.printerrlog('The traceback for the exception was written to the log file')
-        logger.error(traceback.format_exc())
+        if logger:
+            logger.error(traceback.format_exc())
         sys.exit(1)
     except Exception as e:
         traceback.print_exc()