Skip non-finite vertices in GrTriangulator

There isn't a correct way to draw these, and receiving them is a bug from the higher level. Just throw them away so we don't crash, and accept that the draw results will look funny.

Fixes #7235

Diffs=
17f604311 Skip non-finite vertices in GrTriangulator (#7239)

Co-authored-by: Chris Dalton <99840794+csmartdalton@users.noreply.github.com>

.rive_head

diff --git a/.rive_head b/.rive_head
index 16595e9..f350668 100644
--- a/.rive_head
+++ b/.rive_head
@@ -1 +1 @@
-c83e2f1bcaa345aa04f719271cab63dfed3466ba
+17f604311327e786f48dfdfca37501f10dfd5c6c

renderer/gr_triangulator.cpp

diff --git a/renderer/gr_triangulator.cpp b/renderer/gr_triangulator.cpp
index d282d2f..fe995bf 100644
--- a/renderer/gr_triangulator.cpp
+++ b/renderer/gr_triangulator.cpp
@@ -742,11 +742,17 @@
                 {
                     contour++;
                 }
-                this->appendPointToContour(pts[0], contour);
+                if (is_finite(pts[0]))
+                {
+                    this->appendPointToContour(pts[0], contour);
+                }
                 break;
             case PathVerb::line:
             {
-                this->appendPointToContour(pts[1], contour);
+                if (is_finite(pts[1]))
+                {
+                    this->appendPointToContour(pts[1], contour);
+                }
                 break;
             }
             case PathVerb::quad:
@@ -1665,7 +1671,11 @@
 {
     for (VertexList* contour = contours; contourCnt > 0; --contourCnt, ++contour)
     {
-        assert(contour->fHead);
+        if (contour->fHead == nullptr)
+        {
+            continue; // empty
+        }
+
         Vertex* prev = contour->fTail;
         prev->fPoint.x = double_to_clamped_scalar((double)prev->fPoint.x);
         prev->fPoint.y = double_to_clamped_scalar((double)prev->fPoint.y);