feat: Better error handling if config is missing

[sudo-suhas]

Closes #280.

[codecov]

Codecov Report

Merging #281 into master will increase coverage by 1.48%.
The diff coverage is 87.5%.

@@            Coverage Diff             @@
##           master     #281      +/-   ##
==========================================
+ Coverage   90.18%   91.66%   +1.48%     
==========================================
  Files          10       10              
  Lines         163      168       +5     
  Branches       23       25       +2     
==========================================
+ Hits          147      154       +7     
+ Misses         15       13       -2     
  Partials        1        1

Impacted Files	Coverage Δ
src/index.js	76.66% <87.5%> (+12.66%)	⬆️

---

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[codecov]

Codecov Report

Merging #281 into master will increase coverage by 1.48%.
The diff coverage is 87.5%.

@@            Coverage Diff             @@
##           master     #281      +/-   ##
==========================================
+ Coverage   90.18%   91.66%   +1.48%     
==========================================
  Files          10       10              
  Lines         163      168       +5     
  Branches       23       25       +2     
==========================================
+ Hits          147      154       +7     
+ Misses         15       13       -2     
  Partials        1        1

Impacted Files	Coverage Δ
src/index.js	76.66% <87.5%> (+12.66%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 0077644...d1dd4c2. Read the comment docs.

[okonet]

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