
NPE in Type Check if a cleanup pass wiped out an associated node from a JsDoc node, but we still try to check it to see if it is in an extern.
Use default behavior if the JsDoc is not able to be queried.

R=nicksantos
DELTA=29  (28 added, 0 deleted, 1 changed)


Revision created by MOE tool push_codebase.
MOE_MIGRATION=3694


git-svn-id: 818616af560c21f974e3119d89e3310384da871a@1589 b0f006be-c8cd-11de-a2e8-8d36a3108c74

dound/google-closure-compiler,bramstein/closure-compiler-inline,h4ck3rm1k3/javascript-closure-compiler-git,knutwalker/google-closure-compiler,bramstein/closure-compiler-inline,h4ck3rm1k3/javascript-closure-compiler-git,dound/google-closure-compiler,knutwalker/google-closure-compiler