Handle malformed json files in nonce-manager

[orbitlens]

Need to properly handle situations when the .nonce.json file is malformed (can happen in the process).

reflector-node/src/ws-server/nonce-manager.js

Line 6 in fb0957f

const nonces = fs.existsSync(nonceFile) ? JSON.parse(fs.readFileSync(nonceFile).toString().trim()) : {}