remove null output and prettify histogram js

tomcat/webapps/Trawl/histogram.jsp

@@ -20,12 +20,10 @@
 		out.print("var y=[];");
 		out.print("var x=[];");
 		for (Integer year: results){
-			out.print("y.push("+ histogram.get(year) +");");
-			out.print("x.push('"+ year +"');");
+			out.print("\ty.push("+ histogram.get(year) +");\n");
+			out.print("\tx.push('"+ year +"');\n");
 		}
-
-		out.print((String) request.getAttribute("url"));
-
+		
 	%>
 
 	var data = [

tomcat/work/Catalina/localhost/Trawl/org/apache/jsp/histogram_jsp.java

 /*
  * Generated by the Jasper component of Apache Tomcat
  * Version: Apache Tomcat/9.0.6
- * Generated at: 2018-03-28 13:19:07 UTC
+ * Generated at: 2018-03-28 13:37:40 UTC
  * Note: The last modified time of this file was set to
  *       the last modified time of the source file after
  *       generation to assist with modification tracking.
@@ -146,12 +146,10 @@ public final class histogram_jsp extends org.apache.jasper.runtime.HttpJspBase
 		out.print("var y=[];");
 		out.print("var x=[];");
 		for (Integer year: results){
-			out.print("y.push("+ histogram.get(year) +");");
-			out.print("x.push("+ year +");");
+			out.print("\ty.push("+ histogram.get(year) +");\n");
+			out.print("\tx.push('"+ year +"');\n");
 		}
-
-		out.print((String) request.getAttribute("url"));
-
+		
 	
       out.write("\r\n");
       out.write("\r\n");

tomcat/work/Catalina/localhost/Trawl/org/apache/jsp/index_jsp.java

 /*
  * Generated by the Jasper component of Apache Tomcat
  * Version: Apache Tomcat/9.0.6
- * Generated at: 2018-03-28 13:10:15 UTC
+ * Generated at: 2018-03-28 13:32:09 UTC
  * Note: The last modified time of this file was set to
  *       the last modified time of the source file after
  *       generation to assist with modification tracking.