Ignore brew boost uninstall error for iOS (#1471)

It may not be present as it appeared

Relates-To: OLPEDGE-2861

Signed-off-by: Rustam Gamidov <ext-rustam.gamidov@here.com>

Author: rustam-gamidov-here

scripts/ios/azure_ios_build_psv.sh

@@ -18,8 +18,9 @@
 # License-Filename: LICENSE
 
 # Getting rid of boost installed to the CI image (not clear when it appeared)
-# asciidoc and source-highlight are using it so dependencies are ignored
-brew uninstall --ignore-dependencies boost
+# asciidoc and source-highlight are using it so dependencies are ignored.
+# Sometimes there is no boost and there is no need to fail in this case.
+brew uninstall --ignore-dependencies boost || true
 
 # Due to some bug which is cmake cannot detect compiler while called
 # from cmake itself when project is compiled with XCode 12.4 we must