Fix panic on missing or non-map query parameter object

[SebTardif]

Problem

In parameters/query_parameters.go, the helpers.Object case uses a bare type assertion:

encodedObj[params[p].Name].(map[string]interface{})

This panics when:

1. encodedObj is nil (e.g. content-wrapped parameter with a non-JSON media type skips map initialization)
2. The key params[p].Name is absent from encodedObj (map lookup returns nil, bare assertion on nil panics)
3. The value is present but is not a map[string]interface{}

Fix

Replace the bare type assertion with a three-step comma-ok pattern:

if encodedObj == nil {
    break skipValues
}
objVal, objExists := encodedObj[params[p].Name]
if !objExists || objVal == nil {
    break skipValues
}
objMap, mapOk := objVal.(map[string]interface{})
if !mapOk {
    break skipValues
}

This follows the existing control flow: when the value cannot be decoded, we break skipValues (the same pattern used for JSON unmarshal failures a few lines above).

Test

Added TestQueryParamObjectMissingKey_NoPanic which declares an object query parameter with a text/plain content wrapper. This forces the contentWrapped path without JSON decoding, leaving encodedObj nil. Before the fix, this test panics. After the fix, it completes without error.

[codecov]

Codecov Report

❌ Patch coverage is 55.55556% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 97.58%. Comparing base (54cf7b7) to head (d2d6c8e).

Files with missing lines	Patch %	Lines
parameters/query_parameters.go	55.55%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #278      +/-   ##
==========================================
- Coverage   97.63%   97.58%   -0.06%     
==========================================
  Files          64       64              
  Lines        6991     6999       +8     
==========================================
+ Hits         6826     6830       +4     
- Misses        132      134       +2     
- Partials       33       35       +2     

Flag	Coverage Δ
unittests	97.58% <55.55%> (-0.06%)	⬇️

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