fix for #733,732 issue

[tised]

fix for:

• #732
• #733

The problem is that onCreate of content resolver are calling before even Apllication onCreate, so that fields may be null which caused crashes

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@31b12ba). Click here to learn what that means.
The diff coverage is 0%.

@@           Coverage Diff            @@
##             master    #768   +/-   ##
========================================
  Coverage          ?   6.14%           
========================================
  Files             ?      93           
  Lines             ?    5045           
  Branches          ?     455           
========================================
  Hits              ?     310           
  Misses            ?    4709           
  Partials          ?      26

Impacted Files	Coverage Δ
...ns/modifications/ModificationsContentProvider.java	11.11% <0%> (ø)
...ns/contributions/ContributionsContentProvider.java	10% <0%> (ø)

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[misaochan]

Edit: Whoops, sorry. The bug I found was not connected with your PR. :)