Fix issue with empty and or duplicated nodes on resource tree selector

[javierfz1980]

Fix issue with empty and or duplicated nodes on resource tree selector of vch creation wizard

Fixes #441

PR acceptance checklist:

[ x ] All unit tests pass
[ x ] All e2e tests pass
[ n/a ] Unit test(s) included*
[ n/a ] e2e test(s) included*
[ n/a ] Screenshot attached and UX approved*

Screenshots attached of before and after for multivc and singlevc:

singlevc structure:

singlevc before this fix:

singlevc after this fix:

multivc structure:

multivc before this fix:

multivc after this fix:

[codecov-io]

Codecov Report

Merging #448 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #448   +/-   ##
======================================
  Coverage    66.8%   66.8%           
======================================
  Files          60      60           
  Lines        2711    2711           
  Branches      477     477           
======================================
  Hits         1811    1811           
  Misses        612     612           
  Partials      288     288

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