Fix a crash in SkParsePath::FromSVGString

tests/ParsePathTest.cpp

Index: tests/ParsePathTest.cpp
diff --git a/tests/ParsePathTest.cpp b/tests/ParsePathTest.cpp
index d2059d6dd0ec31ef0b4422c0ae830932540a0b1f..561eed04b55af719bf13c9d3c219d4397e2b0c7b 100644
--- a/tests/ParsePathTest.cpp
+++ b/tests/ParsePathTest.cpp
@@ -63,3 +63,11 @@ DEF_TEST(ParsePath, reporter) {
     p.addRoundRect(r, 4, 4.5f);
     test_to_from(reporter, p);
 }
+
+DEF_TEST(ParsePath_invalid, r) {
+    SkPath path;
+    // This is an invalid SVG string, but the test verifies that we do not
+    // crash.
+    bool success = SkParsePath::FromSVGString("M 5", &path);
+    REPORTER_ASSERT(r, !success);
+}