#5 Import fail when invalid mapping entered

[Patrick Jaromin]

The dialog requesting the import sturts-config.xml file's
servlet mapping is not currently validated. Users are
allowed to enter illegal mappings (and there is no
default -- probably should be *.do

Even when legal, if the mapping is not the same as
what's contained in the file, the import will fail by
throwing a stack trace. This error needs to be more
gracefully handled.