Fix #1376 - pending test

org.uqbar.project.wollok.launch/src/org/uqbar/project/wollok/launch/messages.properties

@@ -23,7 +23,7 @@ WollokLauncherOptions_DISABLE_COLORS_REPL = Disables ANSI colors for the console
 WollokLauncherOptions_SEVERAL_FILES = Allows to run several files alltogether
 WollokLauncherOptions_SERVER_PORT = Server port for tests
 WollokLauncherOptions_REQUEST_PORT = Request ports
-WollokLauncherOptions_EVENT_PORT = Events ports
+WollokLauncherOptions_EVENTS_PORT = Events ports
 WollokLauncherOptions_SPECIFIC_FOLDER = Define a specific folder
 WollokLauncherOptions_NUMBER_DECIMALS = Number of decimals to use in the printing and rounding
 WollokLauncherOptions_DECIMAL_PRINTING_STRATEGY = Strategy to use when printing a number

org.uqbar.project.wollok.launch/src/org/uqbar/project/wollok/launch/messages_es.properties

@@ -24,7 +24,7 @@ WollokLauncherOptions_DISABLE_COLORS_REPL = Deshabilita colores para la consola
 WollokLauncherOptions_SEVERAL_FILES = Permite correr varios archivos a la vez
 WollokLauncherOptions_SERVER_PORT = Puerto del server para correr los tests
 WollokLauncherOptions_REQUEST_PORT = Puerto para hacer pedidos
-WollokLauncherOptions_EVENT_PORT = Puerto para escuchar eventos
+WollokLauncherOptions_EVENTS_PORT = Puerto para escuchar eventos
 WollokLauncherOptions_SPECIFIC_FOLDER = Definir una carpeta espec\u00EDfica
 WollokLauncherOptions_NUMBER_DECIMALS = Cantidad de decimales a usar para imprimir y redondear un n\u00FAmero
 WollokLauncherOptions_DECIMAL_PRINTING_STRATEGY = Criterio a usar para imprimir un n\u00FAmero

org.uqbar.project.wollok.ui.launch/src/org/uqbar/project/wollok/ui/i18n/messages.properties

@@ -3,7 +3,7 @@ PROBLEM_LAUNCHING_WOLLOK = Problem launching wollok
 
 ADD_LAUNCH_PLUGIN_DEPENDENCY = Please add dependency to plugin: 
 
-WollokMainTab_PROGRAM = &Program:
+WollokMainTab_PROGRAM_FILE = &Program:
 WollokMainTab_BROWSE = &Browse...
 WollokMainTab_BROWSE_PROGRAM_TITLE = Wollok Program
 WollokMainTab_BROWSE_PROGRAM_DESCRIPTION = Select Wollok Program

org.uqbar.project.wollok.ui.launch/src/org/uqbar/project/wollok/ui/i18n/messages_es.properties

@@ -1,7 +1,7 @@
 
 ADD_LAUNCH_PLUGIN_DEPENDENCY = Por favor agregue la dependencia al plugin: 
 
-WollokMainTab_PROGRAM = &Programa:
+WollokMainTab_PROGRAM_FILE = &Programa:
 WollokMainTab_BROWSE = &Buscar...
 WollokMainTab_BROWSE_PROGRAM_TITLE = Programa Wollok
 WollokMainTab_BROWSE_PROGRAM_DESCRIPTION = Seleccione el programa Wollok

org.uqbar.project.wollok/src/org/uqbar/project/wollok/interpreter/WollokInterpreterEvaluator.xtend

@@ -154,9 +154,13 @@ class WollokInterpreterEvaluator implements XInterpreterEvaluator<WollokObject>
 
 	def dispatch WollokObject evaluate(WVariableReference it) {
 		if (ref instanceof WNamedObject)
-			ref.eval
-		else
-			interpreter.currentContext.resolve(ref.name)
+			return ref.eval
+
+		val variableName = ref.name
+		if (variableName === null) {
+			throw new UnresolvableReference(Messages.LINKING_COULD_NOT_RESOLVE_REFERENCE.trim + " " + astNode.text.trim)
+		}
+		interpreter.currentContext.resolve(variableName)
 	}
 
 	def dispatch WollokObject evaluate(WIfExpression it) {
@@ -447,8 +451,13 @@ class WollokInterpreterEvaluator implements XInterpreterEvaluator<WollokObject>
 	 */
 	def performOpAndUpdateRef(WExpression reference, String operator, ()=>WollokObject rightPart) {
 		validateNullOperand(reference.eval, operator)
+		val variableName = (reference as WVariableReference).ref.name
+		if (variableName === null) {
+			throw new UnresolvableReference(Messages.LINKING_COULD_NOT_RESOLVE_REFERENCE.trim + " " + reference.astNode.text)
+		}
 		val newValue = operator.asBinaryOperation.apply(reference.eval, rightPart).javaToWollok
-		interpreter.currentContext.setReference((reference as WVariableReference).ref.name, newValue)
+
+		interpreter.currentContext.setReference(variableName, newValue)
 		WollokDSK.getVoid(interpreter as WollokInterpreter, reference)
 	}