[fix] lib/http: handle nil body reader for NewExportedServerRequest

[codacy-production[bot]]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
:white_check_mark: +0.06% (target: -1.00%)	:white_check_mark: 100.00%

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (9e803fe82d9c2d4a638487a7c90b79de12cbe9ab) | 4015 | 3621 | 90.19% | | | Head commit (c8445b611a36ec6c9b25d4972788b5f4c1d1ce3b) | 4018 (+3) | 3626 (+5) | 90.24% (**+0.06%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#76) | 12 | 12 | **100.00%** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 87.32%. Comparing base (9e803fe) to head (c8445b6).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #76 +/- ## ========================================== + Coverage 87.23% 87.32% +0.08% ========================================== Files 34 34 Lines 3918 3921 +3 ========================================== + Hits 3418 3424 +6 + Misses 387 385 -2 + Partials 113 112 -1 ```

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