Potential NPE in the Configuration Server's FileInfoVisitor if no element with the "type" key exist

[mariusoe]

In the class FileInfoVisitor of the configuration server, the first line of a configuration file will be converted into a Map representing a Json object. In case a valid JSON object is present in the first comment line but without an element with key type, a NPE will occure:

inspectit-ocelot/components/inspectit-ocelot-configurationserver/src/main/java/rocks/inspectit/ocelot/file/FileInfoVisitor.java

Line 112 in 2de4921

String typeString = "UI_" + jsonMap.get("type").toUpperCase().replace("-", "_");

It has to be verified, that the element exist before invoking methods on it.