[FIX] data_bar_rule_editor: disable "No Color" button

This PR introduces two changes:

1. Fixes a traceback error in the Conditional Formatting Databar
editor by hiding the "Reset" button when not applicable.

2. Prevents errors by validating color input earlier to avoid empty
string parsing issues.

closes #5191

Task: 4102704
Signed-off-by: Rémi Rahir (rar) <rar@odoo.com>

Author: dhrp-odoo

src/components/side_panel/conditional_formatting/cf_editor/cf_editor.ts

@@ -563,6 +563,10 @@ export class ConditionalFormattingEditor extends Component<Props, SpreadsheetChi
   }
 
   updateDataBarColor(color: Color) {
+    if (!isColorValid(color)) {
+      return;
+    }
+
     this.state.rules.dataBar.color = Number.parseInt(color.substr(1), 16);
   }
 

src/components/side_panel/conditional_formatting/cf_editor/data_bar_rule_editor.xml

@@ -5,6 +5,7 @@
       <RoundColorPicker
         currentColor="colorNumberString(rule.color)"
         onColorPicked.bind="updateDataBarColor"
+        disableNoColor="true"
       />
       <div class="o-section-subtitle">Range of values</div>
       <SelectionInput