[FIX] Empty string checks

[ppfeufer]

Description

Fixed

• Empty string checks in JS

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality not to work as expected)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented on my code, particularly in hard-to-understand areas
• I have checked my code and corrected any misspellings

[codecov]

Codecov Report

Merging #192 (67ca73f) into master (f7fa1cd) will not change coverage.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #192   +/-   ##
=======================================
  Coverage   76.90%   76.90%           
=======================================
  Files          15       15           
  Lines         619      619           
  Branches       59       59           
=======================================
  Hits          476      476           
  Misses        130      130           
  Partials       13       13           

Files	Coverage Δ
fleetpings/__init__.py	100.00% <100.00%> (ø)

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