Fix crash while uploading image with whitespace title

[maskaravivek]

Title (required)

Fixes #1635

Description (required)

Fixes #1635

Trimmed the title before checking.

Tests performed (required)

Tested manually on the beta build.

[codecov-io]

Codecov Report

Merging #1636 into 2.8-release will not change coverage.
The diff coverage is 0%.

@@             Coverage Diff             @@
##           2.8-release   #1636   +/-   ##
===========================================
  Coverage         3.87%   3.87%           
===========================================
  Files              150     150           
  Lines             7571    7571           
  Branches           710     710           
===========================================
  Hits               293     293           
  Misses            7261    7261           
  Partials            17      17

Impacted Files	Coverage Δ
.../free/nrw/commons/upload/SingleUploadFragment.java	0% <0%> (ø)	⬆️

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