Fix javascript error in calendar app

Fix owncloud/calendar#409
If you haven't allowed to share items per email the element "email" will never appear and you will get a null exception.

License: WTFPL

core/js/share.js

@@ -331,25 +331,27 @@ OC.Share={
 					.append( insert )
 					.appendTo( ul );
 			};
-			$('#email').autocomplete({
-				minLength: 1,
-				source: function (search, response) {
-					$.get(OC.filePath('core', 'ajax', 'share.php'), { fetch: 'getShareWithEmail', search: search.term }, function(result) {
-						if (result.status == 'success' && result.data.length > 0) {
-							response(result.data);
-						}
-					});
-					},
-				select: function( event, item ) {
-					$('#email').val(item.item.email);
-					return false;
-				}
-			})
-			.data("ui-autocomplete")._renderItem = function( ul, item ) {
-				return $( "<li>" )
-					.append( "<a>" + item.displayname + "<br>" + item.email + "</a>" )
-					.appendTo( ul );
-			};
+			if (link) {
+				$('#email').autocomplete({
+					minLength: 1,
+					source: function (search, response) {
+						$.get(OC.filePath('core', 'ajax', 'share.php'), { fetch: 'getShareWithEmail', search: search.term }, function(result) {
+							if (result.status == 'success' && result.data.length > 0) {
+								response(result.data);
+							}
+						});
+						},
+					select: function( event, item ) {
+						$('#email').val(item.item.email);
+						return false;
+					}
+				})
+				.data("ui-autocomplete")._renderItem = function( ul, item ) {
+					return $( "<li>" )
+						.append( "<a>" + item.displayname + "<br>" + item.email + "</a>" )
+						.appendTo( ul );
+				};
+			}
 
 		} else {
 			html += '<input id="shareWith" type="text" placeholder="'+t('core', 'Resharing is not allowed')+'" style="width:90%;" disabled="disabled"/>';