Added a check in the ctor for a valid filename.  If if is not valid, do not attempt to open that file.
Added a check in the ctor for a valid filename.  If if is not valid, do
not attempt to open that file.

hunter-packages/log4cplus,ccpaging/log4cplus,ccpaging/log4cplus,ccpaging/log4cplus,hunter-packages/log4cplus,csuideal/log4cplus,csuideal/log4cplus,csuideal/log4cplus,hunter-packages/log4cplus,hunter-packages/log4cplus,ccpaging/log4cplus,csuideal/log4cplus