Do not fail if request is not in context

[yakky]

Fix #67

[coveralls]

Coverage decreased (-0.1%) to 88.283% when pulling d326070 on hotfix/error_masking into 575eceb on develop.

[codecov-io]

Codecov Report

Merging #70 into develop will increase coverage by 0.15%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop      #70      +/-   ##
===========================================
+ Coverage    85.39%   85.55%   +0.15%     
===========================================
  Files            8        8              
  Lines          363      367       +4     
  Branches        46       47       +1     
===========================================
+ Hits           310      314       +4     
  Misses          42       42              
  Partials        11       11

Impacted Files	Coverage Δ
djangocms_page_meta/templatetags/page_meta_tags.py	100% <100%> (ø)	⬆️

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[coveralls]

Coverage increased (+0.1%) to 88.556% when pulling 2d731cc on hotfix/error_masking into 575eceb on develop.

[coveralls]

Coverage increased (+0.1%) to 88.556% when pulling 2d731cc on hotfix/error_masking into 575eceb on develop.

[coveralls]

Coverage increased (+0.1%) to 88.556% when pulling 2d731cc on hotfix/error_masking into 575eceb on develop.

[coveralls]

Coverage increased (+0.1%) to 88.556% when pulling 2d731cc on hotfix/error_masking into 575eceb on develop.

[coveralls]

Coverage increased (+0.1%) to 88.556% when pulling 945e180 on hotfix/error_masking into 575eceb on develop.