More safety checks for LiteDb

StabilityMatrix.Core/Database/LiteDbContext.cs

@@ -46,7 +46,8 @@ public class LiteDbContext : ILiteDbContext
         {
             db = new LiteDatabaseAsync(":temp:");
         }
-         
+        else
+        {
             // Attempt to create connection, might be in use
             try
             {
@@ -61,6 +62,7 @@ public class LiteDbContext : ILiteDbContext
             {
                 logger.LogWarning("Database in use or not accessible ({Message}), using temporary database", e.Message);
             }
+        }
         
         // Fallback to temporary database
         db ??= new LiteDatabaseAsync(":temp:");
@@ -136,12 +138,15 @@ public class LiteDbContext : ILiteDbContext
         return changed;
     }
 
-    public async Task<GithubCacheEntry?> GetGithubCacheEntry(string cacheKey)
+    public async Task<GithubCacheEntry?> GetGithubCacheEntry(string? cacheKey)
     {
+        if (string.IsNullOrEmpty(cacheKey)) return null;
+        
         if (await GithubCache.FindByIdAsync(cacheKey).ConfigureAwait(false) is { } result)
         {
             return result;
         }
+        
         return null;
     }