Fixed an issue where empty firebase.json files would break init

src/config.ts

@@ -6,7 +6,6 @@
 import * as clc from "colorette";
 import * as fs from "fs-extra";
 import * as path from "path";
-const cjson = require("cjson");
 
 import { detectProjectRoot } from "./detectProjectRoot";
 import { FirebaseError } from "./error";
@@ -17,7 +16,7 @@
 import { getValidator, getErrorMessage } from "./firebaseConfigValidate";
 import { logger } from "./logger";
 import { loadCJSON } from "./loadCJSON";
 const parseBoltRules = require("./parseBoltRules");
 
 export class Config {
   static DEFAULT_FUNCTIONS_SOURCE = "functions";
@@ -36,20 +35,20 @@
     "apphosting",
   ];
 
   public options: any;
   public projectDir: string;
   public data: any = {};
   public defaults: any = {};
   public notes: any = {};
 
   private _src: any;
 
   /**
    * @param src incoming firebase.json source, parsed by not validated.
    * @param options command-line options.
    */
   constructor(src: any, options: any = {}) {
     this.options = options;
     this.projectDir = this.options.projectDir || detectProjectRoot(this.options);
     this._src = src;
 
@@ -303,7 +302,10 @@
     if (pd) {
       try {
         const filePath = path.resolve(pd, path.basename(filename));
-        const data = cjson.load(filePath);
+        let data: unknown = {};
+        if (fs.statSync(filePath).size > 0) {
+          data = loadCJSON(filePath);
+        }
 
         // Validate config against JSON Schema. For now we just print these to debug
         // logs but in a future CLI version they could be warnings and/or errors.