Fix a regression in 0.17 that caused kitty @ set-colors to require setting cursor_text_color

Fixes #2470

docs/changelog.rst

@@ -15,6 +15,9 @@ To update |kitty|, :doc:`follow the instructions <binary>`.
 - macOS: Fix a regression in 0.17 that caused incorrect variants to be
   automatically selected for some fonts (:iss:`2462`)
 
+- Fix a regression in 0.17 that caused kitty @ set-colors to require setting
+  cursor_text_color (:iss:`2470`)
+
 
 0.17.0 [2020-03-24]
 --------------------

kitty/rc/set_colors.py

@@ -69,7 +69,7 @@ this option, any color arguments are ignored and --configured and --all are impl
                 else:
                     with open(os.path.expanduser(spec), encoding='utf-8', errors='replace') as f:
                         colors.update(parse_config(f))
-            ctc = colors.pop('cursor_text_color')
+            ctc = colors.pop('cursor_text_color', None)
             if isinstance(ctc, Color):
                 cursor_text_color = color_as_int(ctc)
             final_colors = {k: color_as_int(v) for k, v in colors.items() if isinstance(v, Color)}