Exceptions with no argument should not set it to 'None'

src/exceptions.c

@@ -28,7 +28,9 @@
  */
 static KrkValue krk_initException(int argc, const KrkValue argv[], int hasKw) {
 	KrkInstance * self = AS_INSTANCE(argv[0]);
-	krk_attachNamedValue(&self->fields, "arg", argc > 1 ? argv[1] : NONE_VAL());
+	if (argc > 1) {
+		krk_attachNamedValue(&self->fields, "arg", argv[1]);
+	}
 	return argv[0];
 }
 

test/testBareFinally.krk.expect

@@ -1,4 +1,4 @@
-ValueError(None)
+ValueError()
 Done?
 try
 finally

test/testContextManagerException.krk.expect

@@ -12,4 +12,4 @@ Before
 Entering
 Raising
 Exiting with [<class 'type'>, <class 'ValueError'>, <class 'list'>]
-ValueError(None)
+ValueError()

test/testContextManagerRaisesInExit.krk.expect

@@ -2,4 +2,4 @@ Before
 Entering
 Raising
 Exiting with [<class 'type'>, <class 'ValueError'>, <class 'list'>]
-TypeError(None)
+TypeError()

test/testMultipleExcept.krk.expect

@@ -16,4 +16,4 @@ Running finally
 Function exit
 with <class 'NameError'>
 Running finally
-NameError was not caught: NameError(None)
+NameError was not caught: NameError()