Discard empty verbs from RawPath

Diffs=
542e320d2 Discard empty verbs from RawPath (#5166)

.rive_head

diff --git a/.rive_head b/.rive_head
index 03e19ad..bd6b5f4 100644
--- a/.rive_head
+++ b/.rive_head
@@ -1 +1 @@
-abc600932de98bb9552585370faa27b57d96b7db
+542e320d21dc6c27dca04bc7c853bd5f1ae6970a

src/math/raw_path.cpp

diff --git a/src/math/raw_path.cpp b/src/math/raw_path.cpp
index 73d5b9f..90cafdd 100644
--- a/src/math/raw_path.cpp
+++ b/src/math/raw_path.cpp
@@ -63,6 +63,12 @@
 void RawPath::line(Vec2D a)
 {
     injectImplicitMoveIfNeeded();
+    if (a == m_Points.back())
+    {
+        // Discard empty verbs, while retaining the implicit move so the path still has a
+        // potentially empty contour.
+        return;
+    }
     m_Points.push_back(a);
     m_Verbs.push_back(PathVerb::line);
 }
@@ -70,6 +76,12 @@
 void RawPath::quad(Vec2D a, Vec2D b)
 {
     injectImplicitMoveIfNeeded();
+    if (b == a && a == m_Points.back())
+    {
+        // Discard empty verbs, while retaining the implicit move so the path still has a
+        // potentially empty contour.
+        return;
+    }
     m_Points.push_back(a);
     m_Points.push_back(b);
     m_Verbs.push_back(PathVerb::quad);
@@ -78,6 +90,12 @@
 void RawPath::cubic(Vec2D a, Vec2D b, Vec2D c)
 {
     injectImplicitMoveIfNeeded();
+    if (c == b && b == a && a == m_Points.back())
+    {
+        // Discard empty verbs, while retaining the implicit move so the path still has a
+        // potentially empty contour.
+        return;
+    }
     m_Points.push_back(a);
     m_Points.push_back(b);
     m_Points.push_back(c);