Fix panic when internal link has no path segments

This was being triggered when an internal link was given as [[/]],
which is admittedly an invalid link anyway.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/collect_files.rs b/src/collect_files.rs
index dfcc847..64cfc30 100644
--- a/src/collect_files.rs
+++ b/src/collect_files.rs
@@ -279,7 +279,7 @@ impl Website {
             .filter(|s| !s.is_empty() && *s != ".")
             .collect();
         'outer: loop {
-            for i in 0..(segments.len()-1) {
+            for i in 0..(segments.len().saturating_sub(1)) {
                 if segments[i] == ".." {
                     if i == 0 {
                         segments.remove(0);