fix: crash when searching uninitialized channel (#6057)

Fixes a crash when opening search in a split that hasn't yet been fully
initialized

src/widgets/helper/ChannelView.cpp

@@ -299,6 +299,7 @@ ChannelView::ChannelView(QWidget *parent, Split *split, Context context,
 ChannelView::ChannelView(InternalCtor /*tag*/, QWidget *parent, Split *split,
                          Context context, size_t messagesLimit)
     : BaseWidget(parent)
+    , channel_(Channel::getEmpty())
     , split_(split)
     , scrollBar_(new Scrollbar(messagesLimit, this))
     , highlightAnimation_(this)
@@ -903,8 +904,10 @@ LimitedQueueSnapshot<MessageLayoutPtr> &ChannelView::getMessagesSnapshot()
     return this->snapshot_;
 }
 
-ChannelPtr ChannelView::channel()
+ChannelPtr ChannelView::channel() const
 {
+    assert(this->channel_ != nullptr);
+
     return this->channel_;
 }
 
@@ -3194,10 +3197,7 @@ bool ChannelView::canReplyToMessages() const
         return false;
     }
 
-    if (this->channel_ == nullptr)
-    {
-        return false;
-    }
+    assert(this->channel_ != nullptr);
 
     if (!this->channel_->isTwitchChannel())
     {

src/widgets/helper/ChannelView.hpp

@@ -145,7 +145,7 @@ public:
     /// nor IrcChannel.
     /// It's **not** equal to the channel passed in #setChannel().
     /// @see #underlyingChannel()
-    ChannelPtr channel();
+    ChannelPtr channel() const;
 
     /// @brief The channel this view displays messages for
     ///
@@ -359,7 +359,7 @@ private:
     /// screen and will always be a @a Channel, or, it will never be a
     /// TwitchChannel or IrcChannel, however, it will have the same type and
     /// name as @a underlyingChannel_. It's not know to any registry/server.
-    ChannelPtr channel_ = nullptr;
+    ChannelPtr channel_;
 
     /// @brief The channel receiving messages
     ///