[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

tests/test_documentation_build.py

@@ -6,6 +6,7 @@
 
 try:
     import mkdocs
+
     # Even if 'mkdocs' is installed
     # 'mkdocs' is could be imported as <module 'mkdocs' (namespace)>
     # Need to check if 'mkdocs' has '__version__' attribute