Only show "Edit this page" link if the url is not null (#792)

Author: reakaleek

src/Elastic.Markdown/Slices/Layout/_TableOfContents.cshtml

@@ -23,15 +23,18 @@
 					</div>
 				</div>
 			}
-			<div class="edit-this-page">
-				<a href="@Model.GithubEditUrl" class="link">
-					Edit this page
-					<svg class="link-arrow"
-					     xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="1.5" stroke="currentColor">
-						<path stroke-linecap="round" stroke-linejoin="round" d="M17.25 8.25 21 12m0 0-3.75 3.75M21 12H3"/>
-					</svg>
-				</a>
-			</div>
+			@if (Model.GithubEditUrl is not null)
+			{
+				<div class="edit-this-page">
+					<a href="@Model.GithubEditUrl" class="link">
+						Edit this page
+						<svg class="link-arrow"
+						     xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="1.5" stroke="currentColor">
+							<path stroke-linecap="round" stroke-linejoin="round" d="M17.25 8.25 21 12m0 0-3.75 3.75M21 12H3"/>
+						</svg>
+					</a>
+				</div>
+			}
 		</div>
 
 	</nav>