[polari] entryArea: Replace nested ternary operator

[Florian Müllner <fmuellner src gnome org>]

commit bf4c78035222a72bda6236d2884b8acde05547eb
Author: Florian Müllner <fmuellner gnome org>
Date:   Wed Aug 7 00:05:25 2019 +0200

    entryArea: Replace nested ternary operator
    
    The ternary operator allows for concise code, but when starting to nest
    it legibility suffers; replace it with a regular if-else statement in that
    case.
    
    https://gitlab.gnome.org/GNOME/polari/merge_requests/133

 src/entryArea.js | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)
---
diff --git a/src/entryArea.js b/src/entryArea.js
index f28c0b9..71f4a69 100644
--- a/src/entryArea.js
+++ b/src/entryArea.js
@@ -478,10 +478,12 @@ var EntryArea = GObject.registerClass({
     }
 
     _updateNick() {
-        let channel = this._room ? this._room.channel : null;
-        let nick = channel ?
-            channel.connection.self_contact.alias :
-            this._room ? this._room.account.nickname : '';
+        let { channel } = this._room || {};
+        let nick = '';
+        if (channel)
+            nick = channel.connection.self_contact.alias;
+        else if (this._room)
+            nick = this._room.account.nickname;
 
         this._nickLabel.width_chars = Math.max(nick.length, this._maxNickChars);
         this._nickLabel.label = nick;