fix crash if operation stack is 0 in a malformed formula

# Description
fix crash if operation stack is 0 in a malformed formula

Diffs=
b4066558a1 fix crash if operation stack is 0 in a malformed formula (#9435)

Co-authored-by: hernan <hernan@rive.app>

.rive_head

diff --git a/.rive_head b/.rive_head
index 3bbc7d7..7635b52 100644
--- a/.rive_head
+++ b/.rive_head
@@ -1 +1 @@
-5c4e83502fbc0b462760991409f403a7910a7eba
+b4066558a126ad40b9049fe70b99f2ee6b43b3b7

src/data_bind/converters/data_converter_formula.cpp

diff --git a/src/data_bind/converters/data_converter_formula.cpp b/src/data_bind/converters/data_converter_formula.cpp
index 056954b..f7e310c 100644
--- a/src/data_bind/converters/data_converter_formula.cpp
+++ b/src/data_bind/converters/data_converter_formula.cpp
@@ -143,7 +143,8 @@
                 }
             }
         }
-        else if (token->is<FormulaTokenArgumentSeparator>())
+        else if (token->is<FormulaTokenArgumentSeparator>() &&
+                 operationsStack.size() > 0)
         {
             size_t index = operationsStack.size() - 1;
             while (index >= 0)