build/bin/sage-dist-helpers (sdh_actually_pip_install_wheel): Filter out distracting message from 'pip uninstall'

Author: Matthias Koeppe

build/bin/sage-dist-helpers

@@ -398,7 +398,7 @@ sdh_actually_pip_install_wheel() {
     # of sage-conf, sage-setup, etc.) bump the version number, we need to
     # override this behavior.  The pip install option --force-reinstall does too
     # much -- it also reinstalls all dependencies, which we do not want.
-    $sudo sage-pip-uninstall "$distname"
+    $sudo sage-pip-uninstall "$distname" 2>&1 | sed '/^WARNING: Skipping .* as it is not installed./d'
     if [ $? -ne 0 ]; then
         echo "(ignoring error)" >&2
     fi