- include error in log for bad replacer regex

- allow category only with rules (and no labels) in exhaustive mode

pr-collector/src/regexUtils.ts

@@ -54,7 +54,7 @@ export function buildRegex(
       onEmpty
     }
   } catch (e) {
-    core.warning(`⚠️ Bad replacer regex: ${regex.pattern}`)
+    core.warning(`⚠️ Bad regex: ${regex.pattern} (${e})`)
     return null
   }
 }

src/transform.ts

@@ -197,7 +197,7 @@ export function buildChangelog(diffInfo: DiffInfo, origPrs: PullRequestInfo[], o
         if (category.exhaustive_rules !== undefined) {
           exhaustive_rules = category.exhaustive_rules
         }
-        if (matched && category.rules !== undefined) {
+        if ((matched || category.labels === undefined) && category.rules !== undefined) {
           matched = matchesRules(category.rules, pr, exhaustive_rules)
         }
       } else {