Fixes #618: Process fields with integer value 0 correctly

[PhilippGrashoff]

The stacked ternary operator led to a wrong processing of integer 0 values, this fixes it and the value of the dropdown's hidden input is set correctly to 0 instead of an empty string.

Fixes #618

[codecov]

Codecov Report

Merging #619 into develop will decrease coverage by <.01%.
The diff coverage is 66.66%.

@@              Coverage Diff              @@
##             develop     #619      +/-   ##
=============================================
- Coverage      68.37%   68.36%   -0.01%     
  Complexity      1839     1839              
=============================================
  Files            100      100              
  Lines           4351     4353       +2     
=============================================
+ Hits            2975     2976       +1     
- Misses          1376     1377       +1

Impacted Files	Coverage Δ	Complexity Δ
src/FormField/DropDown.php	89.09% <66.66%> (-1.48%)	30 <0> (ø)

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[codecov]

Codecov Report

Merging #619 into develop will decrease coverage by <.01%.
The diff coverage is 66.66%.

@@              Coverage Diff              @@
##             develop     #619      +/-   ##
=============================================
- Coverage      68.37%   68.36%   -0.01%     
  Complexity      1839     1839              
=============================================
  Files            100      100              
  Lines           4351     4353       +2     
=============================================
+ Hits            2975     2976       +1     
- Misses          1376     1377       +1

Impacted Files	Coverage Δ	Complexity Δ
src/FormField/DropDown.php	89.09% <66.66%> (-1.48%)	30 <0> (ø)

---

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 ace9bb8...cb9132e. Read the comment docs.

[DarkSide666]

Well, you could just put braces in that ternary line :)

But this way it's more clear. Thanks !

[PhilippGrashoff]

Yeah, I could have put braces, but unless you know about that ternary stacked mess, you won't understand the braces. And as probably hardly anyone knows about that totally stupid behavior of stacked ternarys, I thought this is more clear.