Fix freshnaut for update_names that don't contain a version number

astronaut/freshnaut

@@ -74,7 +74,13 @@ function make_regex(filename, version)
     --  Returns two regexes, meant to be used in a loop. (See code using this function to know what I mean)
     --]]--
 
-    local regex = escape_regex(filename:gsub(escape_regex(version), "{{version}}"):gsub("%%", "%%%%"))
+    local temp_filename = filename:gsub(escape_regex(version), "{{version}}")
+    if temp_filename == filename then
+        -- If we can't find version in filename, return.
+        return nil, nil
+    end
+
+    local regex = escape_regex(temp_filename:gsub("%%", "%%%%"))
     return regex:gsub("{{version}}", "(.-") .. ")", regex:gsub(".*{{version}}", "(.-)")
 end
 
@@ -118,18 +124,20 @@ function get_available_versions(satellite)
     for update_name in update_names:gmatch("[^,]+") do
         local loop_regex, end_regex = make_regex(update_name, version)
 
-        for x in update_file:gmatch(loop_regex) do
-            -- Sometimes, the match starts way too soon, and we get a very long "version" number.
-            -- Here we make sure we really get the shortest possible match.
-            local version
-            repeat
-                version = x
-                x = x:match(loop_regex)
-            until not x
-            version = version:match(end_regex)
-
-            versions[version] = true
-            count = count + 1
+        if loop_regex and end_regex then
+            for x in update_file:gmatch(loop_regex) do
+                -- Sometimes, the match starts way too soon, and we get a very long "version" number.
+                -- Here we make sure we really get the shortest possible match.
+                local version
+                repeat
+                    version = x
+                    x = x:match(loop_regex)
+                until not x
+                version = version:match(end_regex)
+
+                versions[version] = true
+                count = count + 1
+            end
         end
     end