Fix ReST errors in CHANGES.rst and flake8 errors in expressions and t…

…est_expressions.py

CHANGES.rst

@@ -6,7 +6,9 @@
 ==================
 
 - Cleanups for Plone 5.2:
+
   * in path alternatives, whitespace can now surround ``|``,
+
   * non-ASCII in ``SubPathExpr`` now raises a ``CompilerError``
     (instead of a ``UnicodeEncodeError``; to be compatible with
     the ``chameleon`` template engine).

src/zope/tales/expressions.py

@@ -68,7 +68,7 @@ def __init__(self, path, traverser, engine):
         compiledpath = []
         currentpath = []
         try:
-           path = str(path)
+            path = str(path)
         except Exception as e:
             raise engine.getCompilerError()(
                 'could not convert %r to `str`: %s: %s'

src/zope/tales/tests/test_expressions.py

@@ -173,7 +173,7 @@ def testOrPathWithSpaces(self):
     def testNonAsciiPath(self):
         error = self.engine.getCompilerError()
         with self.assertRaises(error):
-            expr = self.engine.compile(u'path: ä')
+            self.engine.compile(u'path: ä')
 
     def test_path_CONTEXTS(self):
         self.context.contexts = 42