clear expection after try (see custom-components#807)

Author: craigbarratt

custom_components/pyscript/eval.py

@@ -1343,6 +1343,10 @@ async def ast_try(self, arg):
                 val = await self.aeval(arg1)
                 if isinstance(val, EvalStopFlow):
                     return val  # pylint: disable=lost-exception,return-in-finally
+        self.exception = None
+        self.exception_obj = None
+        self.exception_long = None
+        self.exception_curr = None
         return None
 
     async def ast_raise(self, arg):

tests/test_unit_eval.py

@@ -1907,6 +1907,26 @@ def func():
 """,
         "Exception in test line 4 column 0: can only specify single decorator of pyscript_compile, pyscript_executor",
     ],
+    [
+        """
+try:
+    raise ValueError("Random error")
+except KeyError:
+    pass
+""",
+        "Exception in test line 3 column 21: Random error",
+    ],
+    [
+        """
+try:
+    raise ValueError("Random error")
+except ValueError as e:
+    pass
+
+raise
+""",
+        "Exception in test line 7 column 0: No active exception to reraise",
+    ],
 ]