Fixes #61 - importing polymorphic managers

[chrisportela]

No description provided.

[codecov]

Codecov Report

Merging #62 into master will decrease coverage by 0.11%.
The diff coverage is 50%.

@@            Coverage Diff             @@
##           master      #62      +/-   ##
==========================================
- Coverage   63.89%   63.77%   -0.12%     
==========================================
  Files          12       12              
  Lines         781      784       +3     
==========================================
+ Hits          499      500       +1     
- Misses        282      284       +2

Impacted Files	Coverage Δ
polymorphic_tree/managers.py	78.78% <50%> (-4.55%)	⬇️

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[chrisportela]

Sorry I put the wrong issue number. It's #61

Important information is that I was using v1.2.0 at first and then needed the git release for a while. The version on github doesn't have manager.py in master. v1.3.0 has the manager.py file for some reason.

This is strangely inconsistent and we should still probably try importing the right one, but also try the other one, until it's more consistent in the django-polymorphic repo.

[vdboor]

Thanks for pointing this out! I've fixed this in the 1.4.2 release!

The try..catch wasn't needed anymore, polymorphic supported the new import quite a long time already.