fix asan error deref-ing null ptr

src/core/SkPath.cpp

Index: src/core/SkPath.cpp
diff --git a/src/core/SkPath.cpp b/src/core/SkPath.cpp
index 4c2f89730c84f9e109f6f8c8ae5f55b584c9eb9a..10e80a47a33804476650c6a99c9d0248a609f94a 100644
--- a/src/core/SkPath.cpp
+++ b/src/core/SkPath.cpp
@@ -214,6 +214,9 @@ bool SkPath::interpolate(const SkPath& ending, SkScalar weight, SkPath* out) con
     if (verbCount != ending.fPathRef->countVerbs()) {
         return false;
     }
+    if (!verbCount) {
+        return true;
+    }
     out->reset();
     out->addPath(*this);
     fPathRef->interpolate(*ending.fPathRef, weight, out->fPathRef);