bootlint: fix E014.

Fix the following warning from bootlint:
E014 Columns (`.col-*-*`) can only be children of `.row`s or `.form-group`s

@see https://github.com/twbs/bootlint/wiki/E014

Author: php-coder

src/main/webapp/WEB-INF/views/collection/info.html

@@ -118,23 +118,19 @@ <h3 class="text-center" th:text="#{t_collection_of(${ownerName})}">
 							</ul>
 						</div>
 						<div class="col-sm-3">
-							<div class="col-sm-12" togglz:active="SHOW_COLLECTION_CHARTS" th:if="${not #lists.isEmpty(seriesOfCollection)}">
-									<div class="panel panel-default">
-										<div class="panel-heading">
-											<h4 class="panel-title" th:text="#{t_stamps_by_countries}">Stamps by countries</h4>
-										</div>
-										<div id="categories-chart" class="panel-body no-padding"></div>
-									</div>
+							<div class="panel panel-default" togglz:active="SHOW_COLLECTION_CHARTS" th:if="${not #lists.isEmpty(seriesOfCollection)}">
+								<div class="panel-heading">
+									<h4 class="panel-title" th:text="#{t_stamps_by_countries}">Stamps by countries</h4>
 								</div>
+								<div id="categories-chart" class="panel-body no-padding"></div>
+							</div>
 						</div>
 						<div class="col-sm-3">
-							<div class="col-sm-12" togglz:active="SHOW_COLLECTION_CHARTS" th:if="${not #lists.isEmpty(seriesOfCollection)}">
-									<div class="panel panel-default">
-										<div class="panel-heading">
-											<h4 class="panel-title" th:text="#{t_stamps_by_categories}">Stamps by categories</h4>
-										</div>
-										<div id="countries-chart" class="panel-body no-padding"></div>
-									</div>
+							<div class="panel panel-default" togglz:active="SHOW_COLLECTION_CHARTS" th:if="${not #lists.isEmpty(seriesOfCollection)}">
+								<div class="panel-heading">
+									<h4 class="panel-title" th:text="#{t_stamps_by_categories}">Stamps by categories</h4>
+								</div>
+								<div id="countries-chart" class="panel-body no-padding"></div>
 							</div>
 						</div>
 						<div class="col-sm-2">