Exception being thrown in Extension Deactivate

[ashgti]

In the 0.4.1 release, if a folder is converted into a workspace then the bazel extension ends up throwing an error from BuildifierDiagnosticsManager.dispose saying this.disposables is not iterable.

[2021-08-20 10:33:34.862] [exthost] [error] TypeError: this.disposables is not iterable
	at BuildifierDiagnosticsManager.dispose (/Users/harjohn/.vscode/extensions/bazelbuild.vscode-bazel-0.4.1/out/src/buildifier/buildifier_diagnostics_manager.js:85:39)
	at l (/Applications/Visual Studio Code.app/Contents/Resources/app/out/vs/workbench/services/extensions/node/extensionHostProcess.js:14:4943)
	at v._deactivate (/Applications/Visual Studio Code.app/Contents/Resources/app/out/vs/workbench/services/extensions/node/extensionHostProcess.js:90:11421)
	at /Applications/Visual Studio Code.app/Contents/Resources/app/out/vs/workbench/services/extensions/node/extensionHostProcess.js:90:10000
	at Array.map (<anonymous>)
	at v.deactivateAll (/Applications/Visual Studio Code.app/Contents/Resources/app/out/vs/workbench/services/extensions/node/extensionHostProcess.js:90:9988)
	at P.terminate (/Applications/Visual Studio Code.app/Contents/Resources/app/out/vs/workbench/services/extensions/node/extensionHostProcess.js:94:725)
	at h (/Applications/Visual Studio Code.app/Contents/Resources/app/out/vs/workbench/services/extensions/node/extensionHostProcess.js:104:32088)
	at Socket.<anonymous> (/Applications/Visual Studio Code.app/Contents/Resources/app/out/vs/workbench/services/extensions/node/extensionHostProcess.js:104:29731)
	at Socket.emit (events.js:327:22)
	at Pipe.<anonymous> (net.js:673:12)

[ashgti]

https://github.com/bazelbuild/vscode-bazel/blob/12c20773c5bbbdbbd30cc393c414622059c05537/src/buildifier/buildifier_diagnostics_manager.ts#L35 is uninitialized.