Handle non-existent master branch

templates/p404_no_master.rs.html

@@ -0,0 +1,16 @@
+@use super::base;
+@use crate::statics::VersionInfo;
+
+@(version_info: VersionInfo, repo_count: usize)
+
+@:base("Master Branch not Found - Hits-of-Code Badges", "404 - Master Branch not Found", {
+<p>
+<big>Sorry</big>. I couldn't find the master branch of your repositroy.
+Currently this service depends on the existence of a master branch. Please go
+<a href="/">back to the homepage</a>.
+</p>
+
+<p>
+If you think, this is a mistake on my side, please <a href="mailto:mail+hoc@@vbrandl.net">drop me a mail</a>.
+</p>
+}, version_info, repo_count)