check for undefined __hooks in afterpaint

[JoviDeCroock]

Fixes #3642

During suspensions we reset the hooks state https://github.com/preactjs/preact/blob/master/compat/src/suspense.js#L51 which could turn out problematic if an afterpaint is queued 😅

[coveralls]

Coverage remained the same at 99.458% when pulling 1658d43 on fix-undefined-suspense into e201caf on master.

[github-actions]

Size Change: +10 B (0%)

Total Size: 43.5 kB

Filename	Size	Change
hooks/dist/hooks.js	1.31 kB	+2 B (0%)
hooks/dist/hooks.module.js	1.34 kB	+4 B (0%)
hooks/dist/hooks.umd.js	1.4 kB	+4 B (0%)

ℹ️ View Unchanged

Filename	Size	Change
compat/dist/compat.js	3.67 kB	0 B
compat/dist/compat.module.js	3.65 kB	0 B
compat/dist/compat.umd.js	3.73 kB	0 B
debug/dist/debug.js	3 kB	0 B
debug/dist/debug.module.js	3 kB	0 B
debug/dist/debug.umd.js	3.08 kB	0 B
devtools/dist/devtools.js	230 B	0 B
devtools/dist/devtools.module.js	238 B	0 B
devtools/dist/devtools.umd.js	305 B	0 B
dist/preact.js	4 kB	0 B
dist/preact.min.js	4.03 kB	0 B
dist/preact.module.js	4.02 kB	0 B
dist/preact.umd.js	4.06 kB	0 B
jsx-runtime/dist/jsxRuntime.js	317 B	0 B
jsx-runtime/dist/jsxRuntime.module.js	327 B	0 B
jsx-runtime/dist/jsxRuntime.umd.js	395 B	0 B
test-utils/dist/testUtils.js	444 B	0 B
test-utils/dist/testUtils.module.js	444 B	0 B
test-utils/dist/testUtils.umd.js	521 B	0 B

_{compressed-size-action}

[marvinhagemeister]

LGTM 👍