Better error handling when the JSON file uses invalid quotes

[RonWang]

I'm submitting a...

[ ] Regression (a behavior that used to work and stopped working in a new release)
[x] Bug report  
[ ] Performance issue
[ ] Feature request
[ ] Documentation issue or request 
[ ] Other... Please describe: 

Expected Behavior

The error message should be better, telling users the JSON file is invalid.

Current Behavior

$ ask smapi create-skill-for-vendor --manifest file:x.json
/Users/ask-cli/lib/commands/smapi/before-send-processor.js:31
                this.paramsObject[bodyParam.name].vendorId = vendorId;
                                                           ^

TypeError: Cannot create property 'vendorId' on string '{
    “manifest“: {
      ...
    }
}'
    at BeforeSendProcessor.appendVendorId (/Users/ask-cli/lib/commands/smapi/before-send-processor.js:31:60)
    at BeforeSendProcessor.processAll (/Users/ask-cli/lib/commands/smapi/before-send-processor.js:12:14)
...

The JSON file is written using curly quotes, but it's read by CLI as a string... ideally it should be a parsing error.

$ cat x.json
{
    “manifest“: {
        “apis“: {
            “custom“: {}
        },
        “manifestVersion“: “1.0“,
            “locales“: {
                “en-US“: {
                    “description“: “Sample Full Description“,
                    “examplePhrases“: [
                          “Alexa open hello world“,
                          “hello“,
                          “help“
                    ],
                    “keywords“: [],
                    “name“: “Test Skill“,
                    “summary“: “Sample Short Description“
                }
            },
        }
    }
}

Your Environment and Context

• ask-cli version:2.22.4
• Operating System and version: MACOS