fix (enable) error msg on empty query

htroot/yacysearch.html

@@ -115,7 +115,7 @@ Use the RSS search result format to add static searches to your RSS reader, if y
 	::
 	<p>No Results.</p>
 	::
-	<p>No Results. (length of search words must be at least 2 characters)</p>
+	<p>No Results. (length of search words must be at least 1 character)</p>
 	::
 	<div id="results"></div>
     <div class="progress">

htroot/yacysearch.java

@@ -845,8 +845,8 @@ public class yacysearch {
                 prop.put("excluded", "0");
             }
 
-            if ( prop == null || prop.isEmpty() ) {
-                if ( post.get("query", post.get("search", "")).length() < 2 ) {
+            if (prop.isEmpty() || querystring.length() == 0) {
+                if ( querystring.length() == 0 ) { // querystring is trimmed originalquerystring
                     prop.put("num-results", "2"); // no results - at least 2 chars
                 } else {
                     prop.put("num-results", "1"); // no results