hotfix for stow config

[yindia]

TL;DR

Bug :-

Is not working as expected 
if  !reflect.DeepEqual(cfg.Stow, StowConfig{}) {

}

Solution :

if  len(cfg.Stow.Kind) > 0 && len(cfg.Stow.Config) > 0  {

}

Type

• Bug Fix
• Feature
• Plugin

Are all requirements met?

• Code completed
• Smoke tested
• Unit tests added
• Code documentation added
• Any pending items have an associated Issue

Complete description

How did you fix the bug, make the feature etc. Link to any design docs etc

Tracking Issue

Remove the 'fixes' keyword if there will be multiple PRs to fix the linked issue

fixes https://github.com/flyteorg/flyte/issues/

Follow-up issue

NA
OR
https://github.com/flyteorg/flyte/issues/

[codecov]

Codecov Report

Merging #97 (081a2f5) into master (f6f76d8) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #97   +/-   ##
=======================================
  Coverage   66.74%   66.74%           
=======================================
  Files          59       59           
  Lines        2824     2824           
=======================================
  Hits         1885     1885           
  Misses        794      794           
  Partials      145      145           

Flag	Coverage Δ
unittests	65.15% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
storage/stow_store.go	73.01% <100.00%> (ø)

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