Many2Many field - Django - mixer.SELECT not working

I saw this in documentation and tried to implement the same. `mixer.RANDOM` is working fine with m2m field. I will write a failing test case for the same.

```
# Generate SomeModel from SomeApp and select FK or M2M values from db
some = mixer.blend('someapp.somemodel', somerelation=mixer.SELECT)
```

Error.....
`ValueError: Mixer (projects.Project): "" needs to have a value for field "project" before this many-to-many relationship can be used.`
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The issue names no repository files or existing test. Start by reproducing the Django example with a many-to-many field and mixer.SELECT, then add the failing test described in the report; done means the test passes without the ValueError while mixer.RANDOM continues to work.

Written by the indexing model from the issue text.