[skottie] Make stroke width optional

TBR=
Change-Id: I432a79b652ffd5838829f32980e2dcca55d57af4
Reviewed-on: https://skia-review.googlesource.com/141283
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Florin Malita <fmalita@chromium.org>
diff --git a/modules/skottie/src/Skottie.cpp b/modules/skottie/src/Skottie.cpp
index 88e42d4..20390ee 100644
--- a/modules/skottie/src/Skottie.cpp
+++ b/modules/skottie/src/Skottie.cpp
@@ -324,12 +324,10 @@
 
     stroke_node->setStyle(SkPaint::kStroke_Style);
 
-    auto width_attached = BindProperty<ScalarValue>(jstroke["w"], &ctx->fAnimators,
+    BindProperty<ScalarValue>(jstroke["w"], &ctx->fAnimators,
         [stroke_node](const ScalarValue& w) {
             stroke_node->setStrokeWidth(w);
         });
-    if (!width_attached)
-        return nullptr;
 
     stroke_node->setStrokeMiter(ParseDefault<SkScalar>(jstroke["ml"], 4.0f));