Update create_release.sh

Fixed removal of non-existing files.

Author: jgebal

Diff for: .travis/create_release.sh

@@ -9,9 +9,9 @@ sed -i '/CYGWIN\*) cygwin=true/c\  CYGWIN*|MINGW*) cygwin=true ;;' target/appass
 mkdir dist
 mv target/appassembler utPLSQL-cli
 # Remove Oracle libraries du to licensing problems
-rm utPLSQL-cli/lib/ucp*.jar
-rm utPLSQL-cli/lib/ojdbc8*.jar
-rm utPLSQL-cli/lib/orai18n*.jar
+rm -f utPLSQL-cli/lib/ucp*.jar
+rm -f utPLSQL-cli/lib/ojdbc8*.jar
+rm -f utPLSQL-cli/lib/orai18n*.jar
 
 zip -r -q dist/utPLSQL-cli-${TRAVIS_BRANCH}-${VERSION}.zip utPLSQL-cli
 zip -r -q utPLSQL-cli.zip utPLSQL-cli