fix comment map with no body (#682) #603

Job	Run time
lint	25s
Fuzzing Test	1m 15s
ycat	2m 22s
Test with -race (ubuntu-latest, 1.22)	27s
Test with -race (macos-latest, 1.21)	2m 39s
Test with -race (ubuntu-latest, 1.21)	27s
Test with -race (ubuntu-latest, 1.23)	23s
Test with -race (windows-latest, 1.22)	2m 26s
Test in i386 (ubuntu-latest, 1.22)	2m 32s
Test with -race (macos-latest, 1.22)	2m 49s
Test with -race (macos-latest, 1.23)	2m 39s
Test with -race (windows-latest, 1.23)	2m 38s
page	45s
Test in i386 (windows-latest, 1.21)	2m 24s
Test in i386 (windows-latest, 1.23)	4m 7s
Test in i386 (ubuntu-latest, 1.21)	2m 38s
Test in i386 (ubuntu-latest, 1.23)	26s
Test with -race (windows-latest, 1.21)	4m 10s
Test in i386 (windows-latest, 1.22)	4m 1s
Coverage	26s
	39m 59s

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