[ie/joqrag] Fix string literal

Co-authored-by: bashonly <bashonly@bashonly.com>

yt_dlp/extractor/joqrag.py

@@ -37,17 +37,24 @@ class JoqrAgIE(InfoExtractor):
         'only_matching': True,
     }]
 
+    def _extract_metadata(self, variable, html, name):
+        return clean_html(urllib.parse.unquote_plus(self._search_regex(
+            rf'var\s+{variable}\s*=\s*["\']([^"\']+)["\']', html, name, default=''))) or None
+
     def _real_extract(self, url):
         video_id = 'live'
 
         metadata = self._download_webpage(
             'https://www.uniqueradio.jp/aandg', video_id,
             note='Downloading metadata', errnote='Failed to download metadata')
-        title = clean_html(urllib.parse.unquote_plus(
-            self._search_regex(r'var\s+Program_name\s*=\s*["\']([^"\']+)["\']', metadata, 'program title')))
-        desc = clean_html(urllib.parse.unquote_plus(
-            self._search_regex(r'var\s+Program_text\s*=\s*["\']([^"\']+)["\']', metadata, 'program description')))
+        title = self._extract_metadata('Program_name', metadata, 'program title')
+        desc = self._extract_metadata('Program_text', metadata, 'program description')
 
+        if title == '放送休止':
+            self.raise_no_formats('This stream has not started yet', expected=True)
+            formats = []
+            live_status = 'is_upcoming'
+        else:
             m3u8_path = self._search_regex(
                 r'<source\s[^>]*\bsrc="([^"]+)"',
                 self._download_webpage(
@@ -56,6 +63,7 @@ class JoqrAgIE(InfoExtractor):
                 'm3u8 url')
             formats = self._extract_m3u8_formats(
                 urljoin('https://www.uniqueradio.jp/', m3u8_path), video_id, fatal=False)
+            live_status = 'is_live'
 
         return {
             'id': video_id,
@@ -63,5 +71,5 @@ class JoqrAgIE(InfoExtractor):
             'channel': '超!A&G+',
             'description': desc,
             'formats': formats,
-            'live_status': 'is_live',
+            'live_status': live_status,
         }