Tolerate nil primary error in multi error

[vearutop]

Fixes #17

[github-actions]

Lines Of Code

Language	Files	Lines	Code	Comments	Blanks	Complexity	Bytes
Go	8	752 (+8)	494 (+6)	101	157 (+2)	71 (+3)	17.3K (+125B)
Go (test)	8	577 (+5)	420 (+4)	31	126 (+1)	8	15.1K (+212B)
Markdown	4 (+3)	152 (+41)	112 (+31)	0	40 (+10)	0	4.1K (+915B)
YAML	6	483 (+9)	397	36	50 (+9)	0	16K (+339B)

[github-actions]

Go API Changes

# summary
Inferred base version: v1.2.0
Suggested version: v1.2.1

[github-actions]

Unit Test Coverage

total: (statements) 94.1%
changed lines: (statements) 100.0%

Coverage of changed lines

File	Function	Coverage
Total		100.0%
error.go		100.0%
error.go:326	Error	100.0%

Coverage diff with base branch

No changes in coverage.

[github-actions]

Benchmark Result

Benchmark diff with base branch

name                     old time/op    new time/op    delta
SetFields-2                 408ns ± 1%     410ns ± 2%    ~     (p=0.310 n=6+6)
StructuredError_Error-2     627ns ± 0%     628ns ± 1%    ~     (p=0.394 n=6+6)
Fmt_Errorf-2                327ns ± 2%     323ns ± 0%  -1.25%  (p=0.002 n=6+6)
WrapError-2                 810ns ± 3%     802ns ± 0%    ~     (p=0.108 n=6+5)

name                     old alloc/op   new alloc/op   delta
SetFields-2                  224B ± 0%      224B ± 0%    ~     (all equal)
StructuredError_Error-2      224B ± 0%      224B ± 0%    ~     (all equal)
Fmt_Errorf-2                96.0B ± 0%     96.0B ± 0%    ~     (all equal)
WrapError-2                  256B ± 0%      256B ± 0%    ~     (all equal)

name                     old allocs/op  new allocs/op  delta
SetFields-2                  5.00 ± 0%      5.00 ± 0%    ~     (all equal)
StructuredError_Error-2      6.00 ± 0%      6.00 ± 0%    ~     (all equal)
Fmt_Errorf-2                 2.00 ± 0%      2.00 ± 0%    ~     (all equal)
WrapError-2                  5.00 ± 0%      5.00 ± 0%    ~     (all equal)

Benchmark result

name                     time/op
SetFields-2              410ns ± 2%
StructuredError_Error-2  628ns ± 1%
Fmt_Errorf-2             323ns ± 0%
WrapError-2              802ns ± 0%

name                     alloc/op
SetFields-2               224B ± 0%
StructuredError_Error-2   224B ± 0%
Fmt_Errorf-2             96.0B ± 0%
WrapError-2               256B ± 0%

name                     allocs/op
SetFields-2               5.00 ± 0%
StructuredError_Error-2   6.00 ± 0%
Fmt_Errorf-2              2.00 ± 0%
WrapError-2               5.00 ± 0%

[codecov-commenter]

Codecov Report

Merging #18 (19001d0) into master (79ab0c3) will increase coverage by 0.16%.
The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##           master      #18      +/-   ##
==========================================
+ Coverage   91.30%   91.46%   +0.16%     
==========================================
  Files           6        6              
  Lines         207      211       +4     
==========================================
+ Hits          189      193       +4     
  Misses         11       11              
  Partials        7        7              

Flag	Coverage Δ
unittests	91.46% <100.00%> (+0.16%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
error.go	93.22% <100.00%> (+0.23%)	⬆️

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