ticket:11298: fix crash happening when the first non-comment line in BidiTest.txt is ill formed. Method printErrorLine seeks to print paraLevelName, which has not been initialized and is NULL.
The fix is to initialize paraLevelName to "N/A" at the beginning of method TestBidiTest().

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk@36564 251d0590-4201-4cf1-90de-194747b24ca1