System crash

[nike-17@…]

1. Add Component - existed component name

Adding component whose name already existed will make system crash

2. Remove selected component - no component selected

When there's no component selected then click "Remove selected component" will make system >crash
Fix: We need to check comp type
Traceback:

Traceback (most recent call last):
  File "/usr/lib/python2.6/dist-packages/trac/web/api.py", line 378, in send_error
    'text/html')
  File "/usr/lib/python2.6/dist-packages/trac/web/chrome.py", line 745, in render_template
    stream |= self._filter_stream(req, method, filename, stream, data)
  File "/usr/lib/pymodules/python2.6/genshi/core.py", line 132, in __or__
    return Stream(_ensure(function(self)), serializer=self.serializer)
  File "/usr/lib/python2.6/dist-packages/trac/web/chrome.py", line 848, in inner
    data)
  File "/usr/local/lib/python2.6/dist-packages/Default_CC-0.1_r5293-py2.6.egg/defaultcc/admin.py", line 116, in filter_stream
    for comp in components:
TypeError: 'NoneType' object is not iterable

[rjollos]

(In [11734]) Fixes #9555, #10156:

• FIX: Traceback would occur when a system_message is raised, which could be due to component with same name already existing or 'Remove selected items' pressed with no items selected. Thanks to nike-17@… for the report.
• FIX: Package was missing __init__.py file, which could result in a failure of the plugin to load.
• FIX: Removed rollbacks on db upgrade, which fail in Trac 1.0dev and later since the db connection is read-only.

[rjollos]

[11735] should have referenced this ticket. The post-commit hook here apparently doesn't like the colon after the keyword.

(In [11735]) Refs: #9555, #10156: Reverted unintended change in [11734].

[rjollos]

(In [12022]) Refs #9555, #10156: Tagging version 0.2

[rjollos]

(In [12023]) Refs #9555, #10156: Tagging version 0.1