fix: Allowing event without transition

Author: fgmacedo

statemachine/io/scxml.py

@@ -241,7 +241,7 @@ def __init__(
         state_field: str = "state",
         start_value: Any = None,
         rtc: bool = True,
-        allow_event_without_transition: bool = False,
+        allow_event_without_transition: bool = True,
         listeners: "List[object] | None" = None,
     ):
         model = model if model else Model()
@@ -370,9 +370,7 @@ def _parse_state(state_elem, final=False):  # noqa: C901
     for state_elem in scxml.findall(".//final"):
         _parse_state(state_elem, final=True)
 
-    extra_data = {
-        "allow_event_without_transition": True,
-    }
+    extra_data = {}
 
     # To initialize the data model, we override the SM __init__ method
     datamodel = scxml.find("datamodel")

tests/w3c_tests/testcases/test156.scxml

@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- test that an error causes the foreach to stop execution.  The second piece of executable content
+should cause an error, so var1 should be incremented only once -->
+<scxml xmlns="http://www.w3.org/2005/07/scxml" xmlns:conf="http://www.w3.org/2005/scxml-conformance"
+  initial="s0" version="1.0" datamodel="ecmascript">
+  <datamodel>
+    <data id="Var1" expr="0" />
+    <data id="Var2" />
+    <data id="Var3">
+      [1,2,3]
+    </data>
+  </datamodel>
+  <state id="s0">
+    <onentry>
+      <foreach item="Var2" array="Var3">
+        <assign location="Var1" expr="Var1 + 1" />
+        <!-- assign an illegal value to a non-existent var -->
+        <assign location="Var5" expr="return" />
+      </foreach>
+    </onentry>
+    <transition cond="Var1==1" target="pass" />
+    <transition target="fail" />
+  </state>
+  <final id="pass">
+    <onentry>
+      <log label="Outcome" expr="'pass'" />
+    </onentry>
+  </final>
+  <final id="fail">
+    <onentry>
+      <log label="Outcome" expr="'fail'" />
+    </onentry>
+  </final>
+</scxml>