Replace 'raise StopIteration' with a blank 'return', since changes in python-3.7 change StopIeration to a RuntimeError.

volatility/plugins/windows/handles.py

@@ -206,7 +206,7 @@ class Handles(interfaces_plugins.PluginInterface):
             count = 0x1000 / subtype.size
 
         if not self.context.memory[virtual].is_valid(offset):
-            raise StopIteration
+            return
 
         table = ntkrnlmp.object(type_name = "array", offset = offset,
                                 subtype = subtype, count = int(count))
@@ -248,7 +248,7 @@ class Handles(interfaces_plugins.PluginInterface):
             table_levels = handle_table.TableCode & self._level_mask
         except exceptions.PagedInvalidAddressException:
             vollog.log(constants.LOGLEVEL_VVV, "Handle table parsing was aborted due to an invalid address exception")
-            raise StopIteration
+            return
 
         for handle_table_entry in self._make_handle_array(TableCode, table_levels):
             yield handle_table_entry

volatility/plugins/windows/registry/printkey.py

@@ -45,7 +45,7 @@ class PrintKey(plugins.PluginInterface):
             node_path = [hive.get_node(hive.root_cell_offset)]
         if not isinstance(node_path, list) or len(node_path) < 1:
             vollog.warning("Hive walker was not passed a valid node_path (or None)")
-            raise StopIteration
+            return
         node = node_path[-1]
         key_path = key_path or node.get_key_path()
         last_write_time = utility.wintime_to_datetime(node.LastWriteTime.QuadPart)

volatility/plugins/windows/registry/userassist.py

@@ -132,7 +132,7 @@ class UserAssist(interfaces_plugins.PluginInterface):
 
         if not userassist_node_path:
             vollog.warning("list_userassist did not find a valid node_path (or None)")
-            raise StopIteration
+            return
 
         userassist_node = userassist_node_path[-1]
         # iterate through the GUIDs under the userassist key

volatility/plugins/windows/strings.py

@@ -45,7 +45,7 @@ class Strings(interfaces.plugins.PluginInterface):
                 yield (0, (str(string, 'latin-1'), format_hints.Hex(offset), ", ".join(revmap_list)))
             except ValueError:
                 vollog.error("Strings file is in the wrong format")
-                raise StopIteration
+                return
 
     def _parse_line(self, line: bytes) -> typing.Tuple[int, bytes]:
         """Parses a single line from a strings file"""