fix(release): require a value for --from/--only

Amolith created 

The release script previously raised an out-of-bounds error when either
flag was supplied without an argument. Validate the next argv index
exists and surface a usage message instead.

Assisted-by: Crush:minimax-m3

Change summary

release.fish | 10 ++++++++++
1 file changed, 10 insertions(+)

Detailed changes

release.fish 🔗 

@@ -54,9 +54,19 @@ while test $i -le (count $argv)
     switch $argv[$i]
         case --from
             set i (math $i + 1)
+            if test $i -gt (count $argv)
+                echo "Error: --from requires a value" >&2
+                __release_lune_usage >&2
+                exit 1
+            end
             set -g __rl_from $argv[$i]
         case --only
             set i (math $i + 1)
+            if test $i -gt (count $argv)
+                echo "Error: --only requires a value" >&2
+                __release_lune_usage >&2
+                exit 1
+            end
             set -g __rl_only $argv[$i]
         case --help -h
             __release_lune_usage