fix(lookup): cancel note creation during "Create Note with Template" if template was not selected

[hikchoi]

fix(lookup): cancel note creation during "Create Note with Template" if template was not selected

This PR:

• fixes an issue where Create Note with Template will create an empty note even when no template is selected.
• also fixes an issue where the an empty note was assumed as a template when the user hits enter while the template selector quickpick showed no select-able items.
  • this was caused because note lookup provider will assume "Create New" as a selection when selectedItems is an empty list.

Pull Request Checklist

Code

Basics

• code should follow Code Conventions
• circular dependency check: make sure your code is not introducing new circular dependencies in plugin-core. See Avoiding Circular Dependencies.
• sticking to existing conventions instead of creating new ones
  • eg: if configuration for utilities are already in one module or package, add future utilities there as well

Extended

• General
  • check whether code be simplified
  • check if similar function already exist in the codebase. if so, can it be re-used?
  • check if this change adversely impact performance
• Operations
  • when shipping this change, will it just work or will it introduce additional operational overhead due to complicated interface or known bugs?
• Architecture
  • [~] check if code is introducing changes on a foundational class or interface. if so, call for design review if needed
    • eg: making changes to DNode

Instrumentation

Basics

• [~] if you are adding analytics related changes, make sure the Telemetry docs are updated

Extended

• [~] can we track the performance of this change to know if it is successful?
  • eg: see usage for export pod

Tests

Basics

• Write Tests
• Confirm existing tests pass
• Confirm manual testing
• Common cases tested
• 1-2 Edge cases tested
• If your tests changes an existing snapshot, snapshots have been updated

Extended

• [~] If you are adding a new language feature (graphically visible in VS Code/preview/publishing), an example is included in the test workspace
• CSS
  • [~] display is correct for following dimensions
    • [~] sm: screen ≥ 576px, eg. iphonex, (375x812)
    • [~] lg: screen ≥ 992px
    • [~] xxl: screen ≥ 1600px eg. mac (1600x900)
  • [~] display is correct for following browsers (across the various dimensions)
    • [~] safari
    • [~] firefox
    • [~] chrome

Docs

• [~] if your change reflects documentation changes, also submit a PR to dendron-site and mention the doc PR link in your current PR
• [~] does this change introduce a new or better way of doing things that others need to be aware of? if so, an async should be created and a process added in Development or Packages

Close the Loop

Extended

• [~] is this a developer BREAKING change? if another person cloning from this branch will need to adjust their dependencies or mental model of the architecture, then it is. if this is the case, make sure this is communicated according to Close Loop
  • eg: breaking dev change due to new dependency