Merge pull request #69 from rynan4818/songHash_fix2

Fixed an exception when SongCore is not installed.

BeatSaberHTTPStatus/Plugin.cs

@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Reflection;
+using System.Text.RegularExpressions;
 using System.Threading;
 using UnityEngine;
 using UnityEngine.SceneManagement;
@@ -343,7 +344,7 @@ public async void HandleSongStart() {
 			gameStatus.songBPM = level.beatsPerMinute;
 			gameStatus.noteJumpSpeed = diff.noteJumpMovementSpeed;
 			// 13 is "custom_level_" and 40 is the magic number for the length of the SHA-1 hash
-			gameStatus.songHash = level.levelID.StartsWith("custom_level_") && !level.levelID.EndsWith(" WIP") ? level.levelID.Substring(13, 40) : null;
+			gameStatus.songHash = Regex.IsMatch(level.levelID, "^custom_level_[0-9A-F]{40}", RegexOptions.IgnoreCase) && !level.levelID.EndsWith(" WIP") ? level.levelID.Substring(13, 40) : null;
 			gameStatus.levelId = level.levelID;
 			gameStatus.songTimeOffset = (long) (level.songTimeOffset * 1000f / songSpeedMul);
 			gameStatus.length = (long) (level.beatmapLevelData.audioClip.length * 1000f / songSpeedMul);