Bugfix for search orders with empty string or null

[ermand]

Bugfix for search orders

If no string is providing in query string param, then send empty string to OrderRepository@searchOrder

[codecov]

Codecov Report

Merging #20 into master will not change coverage.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master      #20   +/-   ##
=========================================
  Coverage     94.21%   94.21%           
  Complexity      436      436           
=========================================
  Files           107      107           
  Lines          1401     1401           
=========================================
  Hits           1320     1320           
  Misses           81       81

Impacted Files	Coverage Δ	Complexity Δ
.../Http/Controllers/Admin/Orders/OrderController.php	73.33% <100%> (ø)	7 <0> (ø)	⬇️

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[jsdecena]

thanks @ermand ! I can't believe I didn't have that test 😄 Cheers!