Black formatting + run black unconditionally.

format_novel/format_novel.py

@@ -107,7 +107,12 @@ def double_space_and_indent(paragraphs):
         if this_paragraph_plaintext and previous_paragraph_plaintext:
             paragraph.paragraph_format.first_line_indent = docx.shared.Inches(0.5)
 
-        if previous_paragraph and paragraph.style == previous_paragraph.style and not paragraph.text and not previous_paragraph.text:
+        if (
+            previous_paragraph
+            and paragraph.style == previous_paragraph.style
+            and not paragraph.text
+            and not previous_paragraph.text
+        ):
             previous_paragraph._element.getparent().remove(previous_paragraph._element)
 
         previous_paragraph = paragraph

tox.ini

@@ -9,7 +9,7 @@ deps = -rtest_requirements.txt
 pass_env = COVERAGE_FILE
 commands =
     #pytest {posargs}
-    py38,py39: black --check .
+    black --check .
     isort --check-only --settings-path setup.cfg .
     flake8 format_novel tests