fix: decoder panics on tag not found

[abemedia]

No description provided.

[github-actions]

Benchmark Result

Benchmark diff with base branch

goos: linux
goarch: amd64
pkg: github.com/abemedia/go-don
cpu: Intel(R) Xeon(R) Platinum 8272CL CPU @ 2.60GHz
          │ bench-master.txt │         bench-new.txt         │
          │      sec/op      │   sec/op     vs base          │
Handler-2        455.3n ± 1%   456.4n ± 1%  ~ (p=0.493 n=10)

          │ bench-master.txt │         bench-new.txt          │
          │       B/op       │    B/op     vs base            │
Handler-2         72.00 ± 0%   72.00 ± 0%  ~ (p=1.000 n=10) ¹
¹ all samples are equal

          │ bench-master.txt │         bench-new.txt          │
          │    allocs/op     │ allocs/op   vs base            │
Handler-2         2.000 ± 0%   2.000 ± 0%  ~ (p=1.000 n=10) ¹
¹ all samples are equal

pkg: github.com/abemedia/go-don/decoder
                    │ bench-master.txt │           bench-new.txt            │
                    │      sec/op      │   sec/op     vs base               │
Decoder/Gorilla-2          19.38µ ± 0%   19.41µ ± 1%       ~ (p=0.305 n=10)
Decoder/DonCached-2        967.5n ± 1%   961.7n ± 1%  -0.60% (p=0.015 n=10)
Decoder/Don-2              1.016µ ± 1%   1.018µ ± 1%       ~ (p=0.781 n=10)
geomean                    2.670µ        2.668µ       -0.08%

                    │ bench-master.txt │             bench-new.txt             │
                    │       B/op       │     B/op      vs base                 │
Decoder/Gorilla-2         2.500Ki ± 0%   2.500Ki ± 0%       ~ (p=1.000 n=10) ¹
Decoder/DonCached-2         176.0 ± 0%     176.0 ± 0%       ~ (p=1.000 n=10) ¹
Decoder/Don-2               176.0 ± 0%     176.0 ± 0%       ~ (p=1.000 n=10) ¹
geomean                     429.6          429.6       +0.00%
¹ all samples are equal

                    │ bench-master.txt │            bench-new.txt            │
                    │    allocs/op     │ allocs/op   vs base                 │
Decoder/Gorilla-2           166.0 ± 0%   166.0 ± 0%       ~ (p=1.000 n=10) ¹
Decoder/DonCached-2         3.000 ± 0%   3.000 ± 0%       ~ (p=1.000 n=10) ¹
Decoder/Don-2               3.000 ± 0%   3.000 ± 0%       ~ (p=1.000 n=10) ¹
geomean                     11.43        11.43       +0.00%
¹ all samples are equal

Benchmark result

goos: linux
goarch: amd64
pkg: github.com/abemedia/go-don
cpu: Intel(R) Xeon(R) Platinum 8272CL CPU @ 2.60GHz
          │ bench-new.txt │
          │    sec/op     │
Handler-2     456.4n ± 1%

          │ bench-new.txt │
          │     B/op      │
Handler-2      72.00 ± 0%

          │ bench-new.txt │
          │   allocs/op   │
Handler-2      2.000 ± 0%

pkg: github.com/abemedia/go-don/decoder
                    │ bench-new.txt │
                    │    sec/op     │
Decoder/Gorilla-2       19.41µ ± 1%
Decoder/DonCached-2     961.7n ± 1%
Decoder/Don-2           1.018µ ± 1%
geomean                 2.668µ

                    │ bench-new.txt │
                    │     B/op      │
Decoder/Gorilla-2      2.500Ki ± 0%
Decoder/DonCached-2      176.0 ± 0%
Decoder/Don-2            176.0 ± 0%
geomean                  429.6

                    │ bench-new.txt │
                    │   allocs/op   │
Decoder/Gorilla-2        166.0 ± 0%
Decoder/DonCached-2      3.000 ± 0%
Decoder/Don-2            3.000 ± 0%
geomean                  11.43

[codecov]

Codecov Report

Patch coverage: 81.81% and project coverage change: +2.57 🎉

Comparison is base (602b24c) 84.71% compared to head (370e26f) 87.29%.

❗ Current head 370e26f differs from pull request most recent head 8380cd7. Consider uploading reports for the commit 8380cd7 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #100      +/-   ##
==========================================
+ Coverage   84.71%   87.29%   +2.57%     
==========================================
  Files          19       19              
  Lines         772      779       +7     
==========================================
+ Hits          654      680      +26     
+ Misses         92       79      -13     
+ Partials       26       20       -6     

Impacted Files	Coverage Δ
decoder/compile.go	86.98% <0.00%> (+3.64%)	⬆️
decoder/decode.go	97.36% <90.00%> (+41.11%)	⬆️

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