fix: viewId when no View in context

[adil192]

Description

When using the quill editor in the screenshot package, there is no View associated with the context, leading View.of(context) calls to throw.

Note that this PR fixes the View.of(context) error, but the following QuillRawEditorState.renderEditor null error is not fixed yet:

════════ Exception caught by foundation library ════════════════════════════════
The following _TypeError was thrown while dispatching notifications for FocusNode:
Null check operator used on a null value

When the exception was thrown, this was the stack:
#0      QuillRawEditorState.renderEditor (package:flutter_quill/src/editor/raw_editor/raw_editor_state.dart:1177:32)
raw_editor_state.dart:1177
#1      RawEditorStateTextInputClientMixin._updateSizeAndTransform (package:flutter_quill/src/editor/raw_editor/raw_editor_state_text_input_client_mixin.dart:390:20)
raw_editor_state_text_input_client_mixin.dart:390
#2      RawEditorStateTextInputClientMixin.openConnectionIfNeeded (package:flutter_quill/src/editor/raw_editor/raw_editor_state_text_input_client_mixin.dart:97:7)
raw_editor_state_text_input_client_mixin.dart:97
#3      QuillRawEditorState.requestKeyboard (package:flutter_quill/src/editor/raw_editor/raw_editor_state.dart:1194:7)
raw_editor_state.dart:1194

Related issues

We had a similar problem before with:

• [Desktop/any] Can't take screenshot of editor with screenshot package #1314
• Fix errors when not in a View #1315

Type of Change

• ✨ Feature: New functionality without breaking existing features.
• 🛠️ Bug fix: Resolves an issue without altering current behavior.
• 🧹 Refactor: Code reorganization, no behavior change.
• ❌ Breaking: Alters existing functionality and requires updates.
• 🧪 Tests: New or modified tests
• 📝 Documentation: Updates or additions to documentation.
• 🗑️ Chore: Routine tasks, or maintenance.
• ✅ Build configuration change: Build/configuration changes.