make uninitialized global and local variables cause exception.

Global.cpp

@@ -81,6 +81,8 @@ namespace jet {
 	    renderVariableName(variable, name, modifier, lvariables);
 	    name.split(".");
 	    if(name.getList().size() == 1) {
+	       if(variables.find(name[0]) == variables.end())
+		 throw coreutils::Exception("global variable is not initialized.");
 	       return processModifier(variables[name[0]], modifier);
 	    }	    
 	    return getSessionVariable(name);
@@ -90,6 +92,8 @@ namespace jet {
 	 coreutils::MString name;
 	 coreutils::MString modifier;
 	 renderVariableName(variable, name, modifier, lvariables);
+	 if(lvariables.find(name) == lvariables.end())
+	   throw coreutils::Exception("local variable is not initialized.");
 	 return lvariables[name];	 
       }
       throw coreutils::Exception("Expecting a variable initializer ('$[' or '#[').");

tests/testjet.jet

@@ -1,4 +1,4 @@
-#!/home/barant/Development/JetCore/jet-2.0
+#!../jet-2.0
 <jet cgi="true" name1="localname" filterblanklines="true" trimlines="true">
  <header name="Content-Type" value="text/html" />
  <comment>This is a comment and should not show up in the output.</comment>

tests/testvar.jet

@@ -19,4 +19,5 @@ $[var$[i$[letterx]]$[i$[letterx]]]
 $[ix]
 <set name="ix" expr="$[ix]+1" />
 $[ix]
+#[iy]
 </jet>