chore(core): hide empty "info" button on Caesar confirm_with_info()

[no changelog]

core/embed/rust/src/ui/layout_caesar/component/button.rs

@@ -586,7 +586,11 @@ impl ButtonLayout {
         Self::new(
             Some(ButtonDetails::from_text_possible_icon(left)),
             Some(ButtonDetails::armed_text(middle)),
-            Some(ButtonDetails::from_text_possible_icon(right)),
+            if right.is_empty() {
+                None
+            } else {
+                Some(ButtonDetails::from_text_possible_icon(right))
+            },
         )
     }
 
@@ -604,7 +608,11 @@ impl ButtonLayout {
         Self::new(
             Some(ButtonDetails::cancel_icon()),
             Some(ButtonDetails::armed_text(middle)),
-            Some(ButtonDetails::from_text_possible_icon(right)),
+            if right.is_empty() {
+                None
+            } else {
+                Some(ButtonDetails::from_text_possible_icon(right))
+            },
         )
     }
 

core/src/trezor/ui/layouts/caesar/__init__.py

@@ -722,7 +722,7 @@ async def should_show_more(
     Raises ActionCancelled if the user cancels.
     """
 
-    if button_text != DOWN_ARROW:
+    if button_text not in (DOWN_ARROW, ""):
         button_text = INFO_ICON
     result = await interact(
         trezorui_api.confirm_with_info(