[BUG] - In a pipelined request, if a URL contains dependent parameters such that "requestParts" generated for it has an "index" field but it's "value" field is empty, the "internals.requestRegex" doesn't match.

[adisingh007]

For ex:
The current code works fine for the following payload:

"requests": [
    { 
        "method": "get",
        "path": "/some/path"
    },
    {
        "method": "get",
        "path": "/another/path/$0.something"
    }
]

Assuming that 0th request returns a JSON object:

{ "something": "someValue" }

$0.something is parsed to someValue and the path in 1st request is taken as /another/path/someValue

But let's assume that the 0th request does not return a JSON object but just a string, say, theStringValue

And also assume that the payload is now:

"requests": [
    { 
        "method": "get",
        "path": "/some/path"
    },
    {
        "method": "get",
        "path": "/another/path/$0"
    }
]

we'd expect the path to be parsed as /another/path/theStringValue WHICH DOES NOT HAPPEN.

This is because the internals.requestRegex matches only for $n.something and not just for $n where n is any positive integer.