[common][utils] Pre-commit cleanup

Also move all imports at the top, it's counter-productive
to have try/except import clauses on a package that is
mandatory for the code to work.

beat/web/common/utils.py

@@ -32,21 +32,19 @@ from django.core.exceptions import ValidationError
 from django.utils.encoding import force_text
 from django.utils import six
 
+from docutils import utils
+from docutils.nodes import Element
+from docutils.core import Publisher
+
 from ..ui.templatetags.markup import restructuredtext
 
+
 def validate_restructuredtext(value):
     """Validates a piece of restructuredtext for strict conformance"""
 
-    try:
-        from docutils import utils
-        from docutils.nodes import Element
-        from docutils.core import Publisher
-    except ImportError:
-        raise forms.ValidationError("Error in 'reStructuredText' validator: The Python docutils package isn't installed.")
-
     # Generate a new parser (copying `rst2html.py` flow)
     pub = Publisher(None, None, None, settings=None)
-    pub.set_components('standalone', 'restructuredtext', 'pseudoxml')
+    pub.set_components("standalone", "restructuredtext", "pseudoxml")
 
     # Configure publisher
     settings = pub.get_settings(halt_level=5)
@@ -63,12 +61,13 @@ def validate_restructuredtext(value):
 
     # Collect errors via an observer
     errors = []
+
     def error_collector(data):
         # Mutate the data since it was just generated
-        data.line = data['line']
-        data.source = data['source']
-        data.level = data['level']
-        data.type = data['type']
+        data.line = data["line"]
+        data.source = data["source"]
+        data.level = data["level"]
+        data.type = data["type"]
         data.message = Element.astext(data.children[0])
         data.full_message = Element.astext(data)
 
@@ -82,8 +81,8 @@ def validate_restructuredtext(value):
 
     # Apply transforms (and more collect errors)
     document.transformer.populate_from_components(
-        (pub.source, pub.reader, pub.reader.parser, pub.writer,
-         pub.destination))
+        (pub.source, pub.reader, pub.reader.parser, pub.writer, pub.destination)
+    )
     transformer = document.transformer
     while transformer.transforms:
         if not transformer.sorted:
@@ -99,25 +98,33 @@ def validate_restructuredtext(value):
     # errors should be ready
     if errors:
         validation_list = []
-        msg = 'Line %(line)d (severity %(level)d): %(message)s'
+        msg = "Line %(line)d (severity %(level)d): %(message)s"
         for error in errors:
-            #from docutils.parsers.rst module:
-            #debug(0), info(1), warning(2), error(3), severe(4)
+            # from docutils.parsers.rst module:
+            # debug(0), info(1), warning(2), error(3), severe(4)
             if error.level > 1:
-              validation_list.append(ValidationError(
-                  msg, code=error.type.lower(),
-                  params=dict(line=error.line, level=error.level, message=error.message)))
+                validation_list.append(
+                    ValidationError(
+                        msg,
+                        code=error.type.lower(),
+                        params=dict(
+                            line=error.line, level=error.level, message=error.message
+                        ),
+                    )
+                )
         if validation_list:
             raise ValidationError(validation_list)
 
+
 def ensure_html(text):
     try:
         validate_restructuredtext(text)
-    except ValidationError as e:
-        return '<pre>{}</pre>'.format(text)
+    except ValidationError:
+        return "<pre>{}</pre>".format(text)
     else:
         return restructuredtext(text)
 
+
 def ensure_string(data):
     """
     Ensure that we have a str object from data which can be either a str in
@@ -125,6 +132,6 @@ def ensure_string(data):
     """
     if data is not None:
         if isinstance(data, six.binary_type):
-            return data.decode('utf-8')
+            return data.decode("utf-8")
         return data
-    return ''
+    return ""
\ No newline at end of file