Always set `replacement_provided` variable
Salt was complaining that this variable didn't exist in the `orch.removal`
orchestration when removing a master when no replacement was provided.
# ... and we can provide an optional replacement node, and
# this Salt code will always trust that node as a valid replacement
{%- set replacement = salt['pillar.get']('replacement', '') %}
-{%- if replacement %}
- {%- set replacement_provided = True %}
-{%- endif %}
+{%- set replacement_provided = (replacement != '') %}
{%- set replacement_roles = [] %}
