Port fix for bare except from amo-validator

appvalidator/testcases/javascript/call_definitions.py

@@ -88,7 +88,7 @@ def wrap(wrapper, arguments, traverser):
         #                      ", ".join(map(str, params)))
         try:
             return JSLiteral(func(*params), traverser=traverser)
-        except:
+        except (ValueError, TypeError, OverflowError):
             # If we cannot compute output, just return nothing.
             return JSLiteral(None, traverser=traverser)
 

tests/js/test_operators.py

@@ -227,3 +227,12 @@ def test_simple_operators_when_dirty(self):
         """ +
         """y += y + x;""" * 100)  # This bit makes the validator's head explode.
 
+    def test_wrapped_python_exceptions(self):
+        """
+        Test that OverflowErrors in traversal don't crash the validation
+        process.
+        """
+
+        self.run_script("""
+        var x = Math.exp(-4*1000000*-0.0641515994108);
+        """)