Do not fetch/render text layer for unviewable pages

[cdrini]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.80%. Comparing base (a6a8f37) to head (be1823a).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1549   +/-   ##
=======================================
  Coverage   62.80%   62.80%           
=======================================
  Files          67       67           
  Lines        6108     6108           
  Branches     1333     1333           
=======================================
  Hits         3836     3836           
  Misses       2231     2231           
  Partials       41       41           

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[cdrini]

Auto-merging, small one line fix. Confirmed text layer works on normal books.