Fix user IPs table breaking if there are blank IPs.

Fix user_id showing on right of history table in info page.
Add Donations button to readme.

README.md

@@ -8,6 +8,10 @@ A python based web application for monitoring and logging activity on your Plex
 
 * plexPy forum thread: https://forums.plex.tv/discussion/169591/plexpy-another-plex-monitoring-program
 
+If you'd like to buy me a beer, hit the donate button below.
+
+[![Donate](https://www.paypalobjects.com/en_US/i/btn/btn_donate_LG.gif)](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=G9HZK9BDJLKT6)
+
 
 ###Support
 -----------

data/interfaces/default/info.html

@@ -189,6 +189,7 @@ from plexpy import helpers
                         <th class="never" align='left' id="user"></th>
                         <th class="never" align='left' id="media_type"></th>
                         <th class="never" align='left' id="video_decision"></th>
+                        <th class="never" align='left' id="user_id"></th>
                     </tr>
                     </thead>
                     <tbody>

data/interfaces/default/js/tables/user_ips.js

@@ -35,6 +35,7 @@ user_ip_table_options = {
             "width": "15%",
             "className": "modal-control no-wrap",
             "createdCell": function (td, cellData, rowData, row, col) {
+                if (cellData) {
                     if (isPrivateIP(cellData)) {
                         if (cellData != '') {
                             $(td).html(cellData);
@@ -44,6 +45,9 @@ user_ip_table_options = {
                     } else {
                         $(td).html('<a href="#ip-info-modal" data-toggle="modal"><span data-toggle="ip-tooltip" data-placement="left" title="IP Address Info" id="ip-info"><i class="icon-map-marker icon-white"></i></span>&nbsp' + cellData +'</a>');
                     }
+                } else {
+                    $(td).html('n/a');
+                }
             },
             "width": "15%"
         },