Add default constructor to ImageAsset #2446

Job	Run time
Quick Checks	6s
ubuntu-22.04 / gcc / Debug	21m 2s
Documentation	12m 18s
ubuntu-22.04 / gcc / RelWithDebInfo	24m 45s
windows-2019 / Debug	22m 41s
ubuntu-20.04 / clang / Debug	18m 48s
windows-2019 / RelWithDebInfo	27m 21s
ubuntu-20.04 / clang / RelWithDebInfo	25m 6s
windows-2022 / Debug	22m 33s
macos-12 / clang / Debug	18m 36s
windows-2022 / RelWithDebInfo	24m 59s
macos-12 / clang / RelWithDebInfo	25m 58s
	4h 4m 13s

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