title-pattern: match _without_ prefix, if any

In the Git for Windows project, we tried to filter out cURL's release
candidate versions via a title-pattern. However, we also specify a
prefix and that pattern was applied _after_ prefixing the title.

Not what we want. Really only match the original feed's title.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Author: dscho

index.js

@@ -81,11 +81,15 @@ const run = async () => {
     // Iterate
     let counter = 0
     for (const item of feed.items) {
-      const title = `${issueTitlePrefix}${item.title || (item.pubDate && new Date(item.pubDate).toUTCString())}`
-      if (titlePattern && !title.match(titlePattern)) {
-        core.debug(`Feed item skipped because it does not match the title pattern (${title})`)
+      if (!item.title && (titlePattern || !item.pubDate)) {
+        core.debug(`Feed item ${JSON.stringify(item)} skipped because it has no title`)
         continue
       }
+      if (titlePattern && !item.title.match(titlePattern)) {
+        core.debug(`Feed item skipped because it does not match the title pattern (${item.title})`)
+        continue
+      }
+      const title = `${issueTitlePrefix}${item.title || new Date(item.pubDate).toUTCString()}`
 
       core.debug(`Issue '${title}'`)