Fix error when populating the toolbar on page types

[yakky]

Description

Skip adding items to page toolbar on page types

References

Fix #67

Checklist

• [x] I have read the contribution guide
• [x] Code lint checked via inv lint
• [x] changes file included (see docs)
• [x] Usage documentation added in case of new features
• [x] Tests added

[codecov[bot]]

Codecov Report

Merging #76 (94d6710) into develop (3ce5db8) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##           develop       #76   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            9         9           
  Lines          150       152    +2     
  Branches        17        18    +1     
=========================================
+ Hits           150       152    +2     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
djangocms_page_sitemap/cms_toolbars.py	100.00% <100.00%> (ø)

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[coveralls]

Coverage remained the same at 100.0% when pulling 94d67107b1eca43ed05287c6e7fd49dd53801fe3 on bugfix/issue-67-page-types-toolbar into 3ce5db8cda1dee152f22ee18025d00c2b305f458 on develop.