Fixed read tag to throw exception on file error unstead of looping forever.

Global.cpp

@@ -75,12 +75,12 @@ namespace jet {
 	    renderVariableName(variable, modifier, modifier, lvariables);
 	    return;
 	 }      
-	 else if(variable.startsWith("$[")) {	   
-	    name << getVariable(variable, lvariables);	    
-	 }
-	 else if(variable.startsWith("#[")) {	   
-	    name << getVariable(variable, lvariables);	    
-	 }
+	 else if(variable.startsWith("$[") || variable.startsWith("#[")) 	   	   
+	   name << getVariable(variable, lvariables);
+	 else if(variable.ifNext("]"))
+	   return;
+	 else if(!variable.ifNextInclude("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789._-"))
+	   throw coreutils::Exception("invalid variable name.");	 
       }	    
       return;
    }