Hotfix for "yield X from Y" bug.

Author: Nurdok

src/pydocstyle/parser.py

@@ -468,9 +468,12 @@ def _parse_from_import_source(self):
         self.stream.move()
         is_future_import = self.current.value == '__future__'
         self.stream.move()
-        while (self.current.kind in (tk.DOT, tk.NAME, tk.OP) and
-                self.current.value != 'import'):
+        while (self.current is not None and
+               self.current.kind in (tk.DOT, tk.NAME, tk.OP) and
+               self.current.value != 'import'):
             self.stream.move()
+        if self.current is None or self.current.value != 'import':
+            return False
         self.check_current(value='import')
         assert self.current.value == 'import', self.current.value
         self.stream.move()
@@ -480,10 +483,10 @@ def _parse_from_import_names(self, is_future_import):
         """Parse the 'y' part in a 'from x import y' statement."""
         if self.current.value == '(':
             self.consume(tk.OP)
-            expected_end_kind = tk.OP
+            expected_end_kinds = (tk.OP, )
         else:
-            expected_end_kind = tk.NEWLINE
-        while self.current.kind != expected_end_kind and not (
+            expected_end_kinds = (tk.NEWLINE, tk.ENDMARKER)
+        while self.current.kind not in expected_end_kinds and not (
                     self.current.kind == tk.OP and self.current.value == ';'):
             if self.current.kind != tk.NAME:
                 self.stream.move()
@@ -504,4 +507,3 @@ def _parse_from_import_names(self, is_future_import):
                 self.consume(tk.OP)
             self.log.debug("parsing import, token is %r (%s)",
                            self.current.kind, self.current.value)
-