Handling of empty values

[alexejk]

Adding support in decoder to handle empty response values.

As per specification, <struct /> and <array /> are invalid, thus only handling cases below and mapping them to default values:

Value	Default Value
<string/>	""
<int/>, <i4/>	0
<boolean/>	false
<double/>	0.0
<dateTime.iso8601/>	time.Time{}
<base64/>	nil
<array><data/><array>	nil

Fixes #80

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (8c0fd9a) 75.60% compared to head (6fd64e7) 77.52%.

Files	Patch %	Lines
decode.go	91.48%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #81      +/-   ##
==========================================
+ Coverage   75.60%   77.52%   +1.92%     
==========================================
  Files           7        7              
  Lines         541      565      +24     
==========================================
+ Hits          409      438      +29     
+ Misses        101       96       -5     
  Partials       31       31              

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues

Measures
0 Security Hotspots
87.1% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud