`import foo.bar` breaks loading of `python-imports.cfg`

Since recently imports in the form `import foo.bar` don't work any more.

For instance I had this in my `python-imports.cfg`:
```
import pydantic
import pydantic.fields
```

The last line causes this:
```
Failed to load /Users/bari/.vim/python-imports.cfg: could not parse line 53: import pydantic.fields
```

Reproduce the failure with a python-imports.cfg containing both import pydantic and import pydantic.fields, then locate the parser for that configuration. Done means dotted imports load without the reported parse error while ordinary import lines continue to work.

Written by the indexing model from the issue text.