[Picon] tweaks for when service name contains junk

lib/python/Components/Renderer/Picon.py

@@ -89,9 +89,8 @@ def getPiconName(self, serviceRef):
 			fields[2] = "1"
 			pngname = self.findPicon("_".join(fields))
 		if not pngname:  # picon by channel name
-			utf8_name = sanitizeFilename(eServiceReference(serviceRef).getServiceName()).lower()
-			legacy_name = sub("[^a-z0-9]", "", utf8_name.replace("&", "and").replace("+", "plus").replace("*", "star"))  # legacy ascii service name picons
-			if utf8_name:
+			if (sname := eServiceReference(serviceRef).getServiceName()) and "SID 0x" not in sname and (utf8_name := sanitizeFilename(sname).lower()) and utf8_name != "__":  # avoid lookups on zero length service names
+				legacy_name = sub("[^a-z0-9]", "", utf8_name.replace("&", "and").replace("+", "plus").replace("*", "star"))  # legacy ascii service name picons
 				pngname = self.findPicon(utf8_name) or legacy_name and self.findPicon(legacy_name) or self.findPicon(sub(r"(fhd|uhd|hd|sd|4k)$", "", utf8_name).strip()) or legacy_name and self.findPicon(sub(r"(fhd|uhd|hd|sd|4k)$", "", legacy_name).strip())
 		return pngname