DavidMhn

When an object type is an array, for instance ```"type": ["string","integer"]``` The conversion fails with this stack ``` java.lang.IllegalStateException at com.google.gson.JsonArray.getAsString(JsonArray.java:226) at edu.uoc.som.jsonschematouml.generators.JSONSchemaToUML.analyzeProperty(JSONSchemaToUML.java:463) at edu.uoc.som.jsonschematouml.generators.JSONSchemaToUML.analyzeObject(JSONSchemaToUML.java:336) at edu.uoc.som.jsonschematouml.generators.JSONSchemaToUML.analyzeRootSchemaElement(JSONSchemaToUML.java:264) at edu.uoc.som.jsonschematouml.generators.JSONSchemaToUML.analyzeDefinitions(JSONSchemaToUML.java:754) at...