Closes #2302

Using the example in the linked issue, the problem in the current logic is that self.script_binding[1] contains kv's like:

{
    ...,
    'Foo': <class 'openc3.utilities.running_script.Foo'>,
    'foo': <openc3.utilities.running_script.Foo object at 0xffff97102990>,
    'baz': 123
}

The print is added and the statement eval'd only if the debug_text is directly found as a key in that dict. So foo will print, baz with print after baz = foo.bar, but foo.bar is not a dict key and therefore will not eval. By splitting the debug_text by dot and taking the first element, that at least checks if the base instance variable exists.

If you try foo.baz (an attribute that doesn't exist), you get AttributeError : 'Foo' object has no attribute 'baz' which is useful and expected.

Validation

Following the same repro steps, you can now type foo.bar and it will correctly eval to 123: