fix(push): fixes push notifications not showing (#100)

[btaens]

📋 Description

Fixes push notifications not showing on any desktops by checking whether target has image_url when retrieving iconChat, avoiding an exception thrown as described in #100.

🗂 Type

• [ ] 🍾 Feature
• [x] 🚨 Bugfix
• [ ] 📒 Documentation
• [ ] 👷 Internals

🔥 Severity

• [x] 💎 Non-Breaking Changes
• [ ] 💔 Breaking Changes

🖥 Platforms

• [x] 🍏 macOS
• [x] 💾 Windows
• [x] 🐧 Linux

🛃 Tests

• [x] My changes have been tested manually.
• [ ] My changes are covered by automated testing methods.

👨‍🎓 Miscellaneous

• [x] My changes follow the style guide.
• [ ] My changes require updates to the documentation.

[sidneys]

@btaens Thank you, this will be in the next release as well.