Merge pull request #47200 from nextcloud/fix/issue-47193

fix: test variables before returning

apps/dav/lib/CalDAV/EventReaderRRule.php

@@ -57,31 +57,31 @@ public function concludesOn(): DateTime | null {
  }
 
  public function daysOfWeek(): array {
- return $this->byDay;
+ return is_array($this->byDay) ? $this->byDay : [];
  }
 
  public function daysOfMonth(): array {
- return $this->byMonthDay;
+ return is_array($this->byMonthDay) ? $this->byMonthDay : [];
  }
 
  public function daysOfYear(): array {
- return $this->byYearDay;
+ return is_array($this->byYearDay) ? $this->byYearDay : [];
  }
 
  public function weeksOfYear(): array {
- return $this->byWeekNo;
+ return is_array($this->byWeekNo) ? $this->byWeekNo : [];
  }
 
  public function monthsOfYear(): array {
- return $this->byMonth;
+ return is_array($this->byMonth) ? $this->byMonth : [];
  }
 
  public function isRelative(): bool {
  return isset($this->bySetPos);
  }
 
  public function relativePosition(): array {
- return $this->bySetPos;
+ return is_array($this->bySetPos) ? $this->bySetPos : [];
  }
 
 }