Fix apps update failing on empty group inputs with de-client>=1.10.0

[RunQi-Han]

Problem

Workflows using plotly/de-deploy@main with de_client_version: '1.10.0' (or any 1.10.x release) and no group_co_owners / group_viewers inputs fail at the post-deploy step with:

Error updating app [<app-name>]: Group '' could not be found on <host>.
Error: Process completed with exit code 1.

The failing call is from the existing Inject code and deploy step, which always invoked:

de --no-keyfile apps update --name $APP_NAME \
   --add-group-co-owner "${{ inputs.group_co_owners }}" \
   --add-group-viewer "${{ inputs.group_viewers }}"

When neither input is provided, this expands to literal empty strings:

de --no-keyfile apps update --name de5-de-deploy --add-group-co-owner "" --add-group-viewer ""

In de-client 1.9.5 the empty lookup was a silent no-op. In 1.10.0 a new strict-validation block in cli/apps.py diffs requested names against found names and exits 1 when any are missing — empty strings are reported as missing.

Fix

Build the args array conditionally and only invoke apps update when at least one group input is non-empty. Each flag is added independently so workflows that set only one of the two also work.

Also fixes two unrelated input-type typos:

• group_viewers.type: strong -> string
• group_co_owners.type: boolean -> string

Verification

After this change, with de_client_version: '1.10.0':

• Neither group input set -> the apps update call is skipped entirely (no more Group '' could not be found error).
• Only group_co_owners set -> runs apps update --add-group-co-owner <value>.
• Only group_viewers set -> runs apps update --add-group-viewer <value>.
• Both set -> runs apps update --add-group-co-owner <a> --add-group-viewer <b>.

A separate report should also be filed against plotly/de-client so the strict validation in 1.10.x ignores empty-string entries — that would prevent the same failure in any other tooling that templates these flags from possibly-empty values.