If our frame content doesnt exist, treat it as frame not found

tools/frame_get.js

@@ -43,3 +43,7 @@ if (p.get(po)) {
 } else {
 	writeln('Failed to load:'+argv[0]);
 }
+
+writeln('----');
+for (var x in p.raw)
+	writeln(x+':'+JSON.stringify(p.raw[x])+"\r\n");

tools/frame_import.js

@@ -27,6 +27,9 @@ p.get(po);
 var SESSION_EXT = 'vtx';
 require('ansitex/load/session/viewdata.js','SESSION_VIEWDATA');
 
-p.raw = p.file_content(FRAMES_HOME+SESSION_EXT+'/'+po.toString()+'.'+CONTENT_EXT);
+var vtx = p.file_content(FRAMES_HOME+SESSION_EXT+'/'+po.toString()+'.'+CONTENT_EXT);
+
+if (vtx !== undefined)
+	p.raw = vtx;
 
 p.save();