[buildbot] phase1: fix crash on exception during Git update

[LEDE Commits]

ynezz pushed a commit to buildbot.git, branch master:
https://git.openwrt.org/2cbc3df5878f49a90f3fa1d595805e422549e0ec

commit 2cbc3df5878f49a90f3fa1d595805e422549e0ec
Author: Petr Štetiar <ynezz at true.cz>
AuthorDate: Mon May 15 16:18:16 2023 +0200

    phase1: fix crash on exception during Git update
    
    Fixes following exception:
    
     2023-05-15 14:08:56+0000 [-] <Build master_apm821xx/nand number:1 results:success> build got exception when running step Git(name='git', repourl='https://git.openwrt.org/openwrt/openwrt.git', mode='full', method='fresh', locks=renderer(<function NetLockDl at 0x7f5d33351ee0>), haltOnFailure=True)
     2023-05-15 14:08:56+0000 [-] Unhandled Error
            Traceback (most recent call last):
              File "/usr/local/lib/python3.9/dist-packages/twisted/internet/defer.py", line 1792, in gotResult
                _inlineCallbacks(r, gen, status, context)
              File "/usr/local/lib/python3.9/dist-packages/twisted/internet/defer.py", line 1693, in _inlineCallbacks
                result = context.run(
              File "/usr/local/lib/python3.9/dist-packages/twisted/python/failure.py", line 518, in throwExceptionIntoGenerator
                return g.throw(self.type, self.value, self.tb)
              File "/usr/local/lib/python3.9/dist-packages/buildbot/process/build.py", line 576, in _start_next_step_impl
                log.err(e)
            --- <exception caught here> ---
              File "/usr/local/lib/python3.9/dist-packages/buildbot/process/build.py", line 562, in _start_next_step_impl
                results = yield step.startStep(self.conn)
            builtins.KeyError: None
    
    as None is valid property value, but cant be used as dict index.
    
    Signed-off-by: Petr Štetiar <ynezz at true.cz>
---
 phase1/master.cfg | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/phase1/master.cfg b/phase1/master.cfg
index f511e03..c18ee74 100644
--- a/phase1/master.cfg
+++ b/phase1/master.cfg
@@ -142,7 +142,7 @@ def ini_parse_workers(section):
 		log.msg("invalid worker configuration ignored: {}".format(repr(section)))
 		return
 
-	sl_props = { 'dl_lock':None, 'ul_lock':None, 'tag_only':tagonly }
+	sl_props = { 'tag_only':tagonly }
 	if "dl_lock" in section:
 		lockname = section.get("dl_lock")
 		sl_props['dl_lock'] = lockname