Explicitly check event.request in BroadcastUpdatePlugin

[jeffposnick]

R: @philipwalton

Fixes #1931

Right now the plugin assumes that if event is set, then event.request will also be set. That isn't the case if event is an InstallEvent, which is what happens when the plugin is used along with workbox-precaching.

[workbox-pr-bot]

PR-Bot Size Plugin

Changed File Sizes

File	Before	After	Change	GZipped
packages/workbox-broadcast-update/build/workbox-broadcast-update.prod.js	1.85 KB	1.86 KB	+1%	933 B

New Files

No new files have been added.

All File Sizes

View Table

File	Before	After	Change	GZipped
packages/workbox-background-sync/build/workbox-background-sync.prod.js	3.21 KB	3.21 KB	0%	1.39 KB
packages/workbox-broadcast-update/build/workbox-broadcast-update.prod.js	1.85 KB	1.86 KB	+1%	933 B
packages/workbox-build/build/_types.js	41 B	41 B	0%	61 B
packages/workbox-build/build/index.js	3.64 KB	3.64 KB	0%	1.36 KB
packages/workbox-cacheable-response/build/workbox-cacheable-response.prod.js	579 B	579 B	0%	344 B
packages/workbox-cli/build/app.js	5.58 KB	5.58 KB	0%	1.98 KB
packages/workbox-cli/build/bin.js	1.16 KB	1.16 KB	0%	580 B
packages/workbox-core/build/workbox-core.prod.js	5.34 KB	5.34 KB	0%	2.30 KB
packages/workbox-expiration/build/workbox-expiration.prod.js	2.83 KB	2.83 KB	0%	1.24 KB
packages/workbox-google-analytics/build/workbox-offline-ga.prod.js	1.89 KB	1.89 KB	0%	898 B
packages/workbox-navigation-preload/build/workbox-navigation-preload.prod.js	652 B	652 B	0%	317 B
packages/workbox-precaching/build/workbox-precaching.prod.js	4.25 KB	4.25 KB	0%	1.71 KB
packages/workbox-range-requests/build/workbox-range-requests.prod.js	1.51 KB	1.51 KB	0%	758 B
packages/workbox-routing/build/workbox-routing.prod.js	3.38 KB	3.38 KB	0%	1.47 KB
packages/workbox-strategies/build/workbox-strategies.prod.js	4.86 KB	4.86 KB	0%	1.19 KB
packages/workbox-streams/build/workbox-streams.prod.js	1.38 KB	1.38 KB	0%	677 B
packages/workbox-sw/build/workbox-sw.js	1.33 KB	1.33 KB	0%	741 B
packages/workbox-webpack-plugin/build/generate-sw.js	5.29 KB	5.29 KB	0%	1.84 KB
packages/workbox-webpack-plugin/build/index.js	349 B	349 B	0%	255 B
packages/workbox-webpack-plugin/build/inject-manifest.js	7.22 KB	7.22 KB	0%	2.48 KB
packages/workbox-window/build/workbox-window.dev.umd.js	30.37 KB	30.37 KB	0%	8.01 KB
packages/workbox-window/build/workbox-window.prod.umd.js	4.65 KB	4.65 KB	0%	1.80 KB

Workbox Aggregate Size Plugin

8.77KB gzip'ed (58% of limit)
22.04KB uncompressed