fixed the NPE from prev commit

Author Jonathan Bell <jbell@cs.columbia.edu>
Author date 2012-03-21 21:36:28
Author local date 2012-03-21 17:36:28 -0400
Committer Jonathan Bell <jbell@cs.columbia.edu>
Committer date 2012-03-21 21:36:28
Committer local date 2012-03-21 17:36:28 -0400
Commit 0c1e4e52ddeb7ded52ae613e188bd6c28c80b4a9
Tree 66af60c80e6fdb889b15475e1c468c4c1926e0ef
Parent ed80d7fb076332e8b2a9aa589c2062674bba35ae
fixed the NPE from prev commit
Affected files:
Columbus2Tester/columbus2.log
Columbus2Tester/src/edu/columbia/cs/psl/metamorphic/example/ProcessorTester.java
columbus2/src/edu/columbia/cs/psl/metamorphic/runtime/Interceptor.java
columbus2/src/edu/columbia/cs/psl/metamorphic/struct/MetamorphicMethodInvocation.java