unicode_input kitten: Fix a regression that broke using indices to select recently used symbols.

docs/changelog.rst

@@ -15,6 +15,9 @@ To update |kitty|, :doc:`follow the instructions <binary>`.
 - When piping data to a child in the pipe command do it in a thread so as not
   to block the UI (:iss:`1708`)
 
+- unicode_input kitten: Fix a regression that broke using indices to select
+  recently used symbols.
+
 0.14.2 [2019-06-09]
 ---------------------
 

kittens/unicode_input/main.py

@@ -240,10 +240,9 @@ class Table:
 
 
 def is_index(w):
-    try:
+    with suppress(Exception):
         int(w.lstrip(INDEX_CHAR), 16)
         return True
-    except Exception:
     return False
 
 
@@ -295,9 +294,10 @@ class UnicodeInput(Handler):
         self.current_char = None
         if self.mode is HEX:
             with suppress(Exception):
-                if self.line_edit.current_input.startswith(INDEX_CHAR) and len(self.line_edit.current_input) > 1:
+                if self.line_edit.current_input.startswith(INDEX_CHAR):
+                    if len(self.line_edit.current_input) > 1:
                         self.current_char = chr(self.table.codepoint_at_hint(self.line_edit.current_input[1:]))
-                else:
+                elif self.line_edit.current_input:
                     code = int(self.line_edit.current_input, 16)
                     self.current_char = chr(code)
         elif self.mode is NAME:
@@ -392,7 +392,8 @@ class UnicodeInput(Handler):
             try:
                 val = int(self.line_edit.current_input, 16)
             except Exception:
-                return
+                pass
+            else:
                 if key_event.key is TAB:
                     self.line_edit.current_input = hex(val + 0x10)[2:]
                     self.refresh()