Raise an error if the JSON file for configs is not properly formatted in JSON

biopet-framework/src/main/java/nl/lumc/sasc/biopet/core/Config.scala

@@ -19,7 +19,7 @@ class Config(var map: Map[String,Any]) extends Logging {
         logger.info("Loading config file: " + file)
         loadConfigFile(file)
       }
-      else logger.warn("QUEUE_CONFIG value  found but file does not exist, no global config is loaded")
+      else logger.warn("QUEUE_CONFIG value found but file does not exist, no global config is loaded")
     } else logger.warn("QUEUE_CONFIG value not found, no global config is loaded")
   }
   
@@ -28,6 +28,12 @@ class Config(var map: Map[String,Any]) extends Logging {
   def loadConfigFile(configFile:File) {
     var returnMap: Map[String,Any] = Map()
     var configJson = JSON.parseFull(scala.io.Source.fromFile(configFile).mkString)
+    
+    if ( configJson == None ) {
+      println( "[ERROR] The config JSON file is either not properly formatted or not a JSON file"  )
+      System.exit(1)
+    }
+    
     this.logger.debug("Jsonfile: " + configFile)
     this.logger.debug("Contain: " + configJson)
     configJson.get match {