Find probable issues/missed casses

some probable issue
1 ->
`asname` is not a mandatory field in ast.alias class maybe `OBJECTS.append(obj.asname)` will raise an error.
from python ast documentaion
https://docs.python.org/3/library/ast.html
```
class ast.alias(name, asname)
Both parameters are raw strings of the names. asname can be None if the regular name is to be used.
```
Here we are just adding this field value i.e None to the OBJECTS list what if we were finding `asname` which is None in this case in the AST_NODE dictionary.
It will throw KeyError
There must be some cases described above

2 ->
There is one obvious missed case, the hint is in 1 and
`from os import path as img_path`

3 ->
None of the nodes related to match of latest python releases is parsed currently i.e `find_unused_imports` will not work with the latest python releases