chore:remove unnecessary check

[nmmsantos]

Describe the PR
This will remove the check for existence of the SearchDir on swag fmt which is breaking the comma separated list feature from swag fmt -d cmd/hello,./, fore example.

Relation issue

Additional context
The check is being made after splitting the list on the comma character, later, in the FormatAPI call.

[codecov]

Codecov Report

Merging #1073 (f7e9fba) into master (75e9d01) will not change coverage.
The diff coverage is n/a.

❗ Current head f7e9fba differs from pull request most recent head 98750e6. Consider uploading reports for the commit 98750e6 to get more accurate results

@@           Coverage Diff           @@
##           master    #1073   +/-   ##
=======================================
  Coverage   94.19%   94.19%           
=======================================
  Files           9        9           
  Lines        2310     2310           
=======================================
  Hits         2176     2176           
  Misses         70       70           
  Partials       64       64           

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[ubogdan]

LGTM