fix(net/ghttp): panic when post empty string parameter to *ghttp.UploadFile

[gqcn]

fixed #4193

[gqcn]

related #4203

[hailaz]

@gqcn 过不了单测

[Issues-translate-bot]

Bot detected the issue body's language is not English, translate it automatically. 👯👭🏻🧑‍🤝‍🧑👫🧑🏿‍🤝‍🧑🏻👩🏾‍🤝‍👨🏿👬🏿

---

@gqcn Can't pass the single test

[Copilot]

Pull Request Overview

This PR fixes a panic when posting an empty string parameter to *ghttp.UploadFile by improving type conversion and error handling. Key changes include updates to conversion functions (struct, map, float), a modification of the default error handling in scanning, and the addition of a new test case for issue 4193.

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
util/gconv/internal/converter/converter_struct.go	Updated error message and early return when parameters cannot be converted to a struct pointer.
util/gconv/internal/converter/converter_map.go	Added conditions to ensure an empty map is returned when required by the conversion options.
util/gconv/internal/converter/converter_float.go	Added empty string checks to prevent parsing errors in float32 and float64 conversions.
util/gconv/internal/converter/converter_convert.go	Refactored custom converter variable assignment and updated code comments.
util/gconv/gconv_scan.go	Changed the Scan option default from ContinueOnError true to false.
net/ghttp/ghttp_z_unit_issue_test.go	Added a new test case for issue 4193 to confirm correct behavior when an empty file parameter is posted.

Comments suppressed due to low confidence (3)

util/gconv/internal/converter/converter_struct.go:167

• Consider using %v instead of %s for formatting pointerReflectValue.Type() to ensure the type is represented correctly.

"convert params \"%v\" to \"%s\" failed"

util/gconv/internal/converter/converter_float.go:75

• The empty string check for variable s is performed twice in the Float32 conversion; consider removing the redundant check to avoid unnecessary computations.

if s == "" {

util/gconv/internal/converter/converter_float.go:149

• The empty string check for variable s is redundantly performed in the Float64 conversion function; removing the duplicate check can simplify the logic.

if s == "" {