Error message (1)

In a previous version of the JsonPreprocessor, this code

`"par${...}am2" : "123"`

caused:

`'Invalid parameter format in line: "par${...}am2" : "123"'`

In current version this changed to:

`''NoneType' object is not subscriptable'`

The first error message is the better one.

Addendum:

Finally this has to be a naming convention issue.


