clang-format: Fix crasher on incomplete condition compilation.

Previously crashing input:
  void f(
  #if A
      );
  #else
  #endif

llvm-svn: 226451
diff --git a/clang/unittests/Format/FormatTest.cpp b/clang/unittests/Format/FormatTest.cpp
index 548273a..f267c94 100644
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/unittests/Format/FormatTest.cpp
@@ -2930,6 +2930,12 @@
                "#if a\n"
                "#else\n"
                "#endif");
+
+  verifyFormat("void f(\n"
+               "#if A\n"
+               "    );\n"
+               "#else\n"
+               "#endif");
 }
 
 TEST_F(FormatTest, GraciouslyHandleIncorrectPreprocessorConditions) {