account for last child bottom border; use 0 instead of none

dist/css/bootstrap.css

@@ -5447,6 +5447,37 @@ a.list-group-item:focus {
   border-top: 1px solid #dddddd;
 }
 
+.panel > .table-bordered {
+  border: 0;
+}
+
+.panel > .table-bordered > thead > tr > th:first-child,
+.panel > .table-bordered > tbody > tr > th:first-child,
+.panel > .table-bordered > tfoot > tr > th:first-child,
+.panel > .table-bordered > thead > tr > td:first-child,
+.panel > .table-bordered > tbody > tr > td:first-child,
+.panel > .table-bordered > tfoot > tr > td:first-child {
+  border-left: 0;
+}
+
+.panel > .table-bordered > thead > tr > th:last-child,
+.panel > .table-bordered > tbody > tr > th:last-child,
+.panel > .table-bordered > tfoot > tr > th:last-child,
+.panel > .table-bordered > thead > tr > td:last-child,
+.panel > .table-bordered > tbody > tr > td:last-child,
+.panel > .table-bordered > tfoot > tr > td:last-child {
+  border-right: 0;
+}
+
+.panel > .table-bordered > thead > tr:last-child > th,
+.panel > .table-bordered > tbody > tr:last-child > th,
+.panel > .table-bordered > tfoot > tr:last-child > th,
+.panel > .table-bordered > thead > tr:last-child > td,
+.panel > .table-bordered > tbody > tr:last-child > td,
+.panel > .table-bordered > tfoot > tr:last-child > td {
+  border-bottom: 0;
+}
+
 .panel-heading {
   padding: 10px 15px;
   border-bottom: 1px solid transparent;

less/panels.less

@@ -63,18 +63,23 @@
     border-top: 1px solid @table-border-color;
   }
   > .table-bordered {
-    border: none;
+    border: 0;
     > thead,
     > tbody,
     > tfoot {
       > tr {
         > th:first-child,
         > td:first-child {
-          border-left: none;
+          border-left: 0;
         }
         > th:last-child,
         > td:last-child {
-          border-right: none;
+          border-right: 0;
+        }
+
+        &:last-child > th,
+        &:last-child > td {
+          border-bottom: 0;
         }
       }
     }