[zed] Ensure get_requests_for_local_unit doesn't fail on incomplete relation

This is a rebuild/make sync for charms to pickup the fix in charmhelpers to fix
any inadvertant accesses of ['ca'] in the relation data before it is available
from vault in the certificates relation.  Fix in charmhelpers is in [1].

[1] https://github.com/juju/charm-helpers/pull/826
Closes-Bug: #2028683

Change-Id: I4178dc384ef49457fd82649e4ae99850531eb1f2

charmcraft.yaml

@@ -4,6 +4,9 @@ parts:
   charm:
     source: src/
     plugin: reactive
+    reactive-charm-build-arguments:
+      - --use-lock-file-branches
+      - --verbose
     build-snaps:
       - charm/3.x/stable
     build-environment:

osci.yaml

@@ -6,4 +6,4 @@
       needs_charm_build: true
       charm_build_name: nova-cell-controller
       build_type: charmcraft
-      charmcraft_channel: 2.0/stable
+      charmcraft_channel: 2.1/stable

rebuild

@@ -2,4 +2,4 @@
 # when dependencies of the charm change,
 # but nothing in the charm needs to.
 # simply change the uuid to something new
-53e34944-1178-11ec-9edc-c38acc23d967
+7122132a-3dd4-11ee-b1fd-e3b5125dc9a2

tox.ini

@@ -75,6 +75,7 @@ commands = stestr run --slowest {posargs}
 [testenv:pep8]
 basepython = python3
 deps = flake8==3.9.2
+       PyYAML==6.0.1
        git+https://github.com/juju/charm-tools.git
 commands = flake8 {posargs} src unit_tests