Malformed package.json files prevent server from responding

[sqs]

If a package.json file that's not inside a /node_modules/ tree is malformed (e.g., it has a BOM at the beginning, or a syntax error, or anything else that causes packages.ts's JSON.parse of it to fail), then the method handling will fail with the following error:

03:21:21         lsp-proxy | ERROR workspace/xdependencies failed: jsonrpc2: code -32001 message: Expected file:///test/rules/no-implicit-dependencies/default/bom/package.json to be registered in PackageManager {"error":"jsonrpc2: code -32001 message: Expected file:///test/rules/no-implicit-dependencies/default/bom/package.json to be registered in PackageManager","id":1,"method":"workspace/xdependencies","mode":"typescript_bg","repo":"github.com/palantir/tslint","rev":"235561e411c58ecbd4d96844fae28e998f0ccbda","session":""}

Note that this is for the workspace/xdependencies method, but I suspect it would occur for workspace/references too.

(That is in the palantir/tslint repo, which has several malformed package.json files.)