Fixes QPP with no comma bug in formatter

[tomasnyberg]

Description

In #402 Oskar pointed out that one of his queries refused to format, and it turned out the formatter was experiencing an internal bug. The culprit turned out to be a QPP that failed because we always assume there is a comma within it, even though it can look like this as well: {4}

This PR addresses that grammar case in visitQuantifier and adds a test for it.

Testing

• Added a new test for the case described
• Tried the query mentioned in Adds formatting capabilities to vs-code extension #402 and it now formats like expected.
• Ran about 50k sample queries for good measure to see if this breaks anything else and they passed

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Latest commit: a89f2ba

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