Fix error when imported fleet has no capacity (#3652) #6610

Job	Run time
compute-version	3s
build-docs / build-docs	1m 12s
build-artifacts / runner-test (macos-latest)	1m 19s
build-artifacts / frontend-build	13s
build-artifacts / code-lint	46s
build-artifacts / gateway-build	12s
build-artifacts / runner-test (ubuntu-latest)	1m 15s
build-artifacts / generate-json-schema	17s
build-artifacts / python-build	18s
build-artifacts / python-test (macos-latest, 3.12)	2m 40s
build-artifacts / python-test (ubuntu-latest, 3.10)	8m 57s
build-artifacts / python-test (ubuntu-latest, 3.9)	8m 36s
build-artifacts / python-test (ubuntu-latest, 3.12)	8m 38s
build-artifacts / python-test (windows-latest, 3.11)	2m 32s
build-artifacts / python-test (macos-latest, 3.9)	4m 50s
build-artifacts / python-test (windows-latest, 3.9)	2m 54s
build-artifacts / python-test (windows-latest, 3.13)	2m 9s
build-artifacts / python-test (macos-latest, 3.11)	3m 48s
build-artifacts / python-test (ubuntu-latest, 3.11)	8m 17s
build-artifacts / python-test (macos-latest, 3.13)	4m 10s
build-artifacts / python-test (windows-latest, 3.12)	2m 12s
build-artifacts / python-test (windows-latest, 3.10)	2m 9s
build-artifacts / python-test (ubuntu-latest, 3.13)	8m 38s
build-artifacts / python-test (macos-latest, 3.10)	3m 21s
build-artifacts / runner-compile (ubuntu-24.04-arm, linux, arm64)	37s
build-artifacts / runner-compile (ubuntu-24.04, linux, amd64)	56s
upload-pre-pypi-artifacts / upload-pre-pypi-artifacts	19s
upload-post-pypi-artifacts / upload-post-pypi-artifacts	14s
	1h 21m 32s

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