Fix some polls crashing at decoding

Packages/Models/Sources/Models/Poll.swift

@@ -20,12 +20,24 @@ public struct Poll: Codable, Equatable, Hashable {
   }
 
   public let id: String
-  public let expiresAt: ServerDate
+  public let expiresAt: NullableString
   public let expired: Bool
   public let multiple: Bool
   public let votesCount: Int
-  public let votersCount: Int?
   public let voted: Bool?
   public let ownVotes: [Int]?
   public let options: [Option]
 }
+
+public struct NullableString: Codable, Equatable, Hashable {
+  public let value: String?
+  
+  public init(from decoder: Decoder) throws {
+    do {
+      let container = try decoder.singleValueContainer()
+      self.value = try container.decode(String.self)
+    } catch {
+      self.value = nil
+    }
+  }
+}

Packages/Status/Sources/Status/Poll/StatusPollView.swift

@@ -72,9 +72,9 @@ public struct StatusPollView: View {
       Text(" ⸱ ")
       if viewModel.poll.expired {
         Text("status.poll.closed")
-      } else {
+      } else if let date = viewModel.poll.expiresAt.value?.asDate {
         Text("status.poll.closes-in")
-        Text(viewModel.poll.expiresAt.asDate, style: .timer)
+        Text(date, style: .timer)
       }
     }
     .font(.scaledFootnote)