fix for non existent user metatag searches, fixes for note styling

app/assets/stylesheets/specific/notes.css.scss

@@ -6,8 +6,9 @@ div#note-container {
     position: absolute;
     border: 1px solid black;
     background: white;
-    min-width: 5em;
+    min-width: 10px;
     min-height: 1em;
+    line-height: normal;
     cursor: pointer;
     padding: 4px;
     z-index: 1500;

app/models/tag.rb

@@ -241,6 +241,7 @@ class Tag < ActiveRecord::Base
             
           when "user"
             q[:uploader_id] = User.name_to_id($2)
+            q[:uploader_id] = -1 if q[:uploader_id].nil?
             
           when "-approver"
             q[:approver_id_neg] ||= []
@@ -248,6 +249,7 @@ class Tag < ActiveRecord::Base
             
           when "approver"
             q[:approver_id] = User.name_to_id($2)
+            q[:approver_id] = -1 if q[:approver_id].nil?
             
           when "-pool"
             q[:tags][:exclude] << "pool:#{Pool.name_to_id($2)}"