Unsuccessfully exit from script if jazzy gem isn't found

scripts/common.sh

@@ -124,7 +124,6 @@ function action() {
 			DESTINATION='platform=OS X,arch=x86_64'
 	fi
 
-	STATUS=""
     set -x
 		killall Simulator || true
 	xcodebuild -workspace "${WORKSPACE}" \
@@ -132,9 +131,13 @@ function action() {
 				-configuration "${CONFIGURATION}" \
 				-derivedDataPath "${BUILD_DIRECTORY}" \
 				-destination "$DESTINATION" \
-				$ACTION | tee build/last-build-output.txt | xcpretty -c; STATUS=${PIPESTATUS[0]}
+				$ACTION | tee build/last-build-output.txt | xcpretty -c
+    exitIfLastStatusWasUnsuccessful
     set +x
+}
 
+function exitIfLastStatusWasUnsuccessful() {
+  STATUS=${PIPESTATUS[0]}
 	if [ $STATUS -ne 0 ]; then
 		echo $STATUS
  		exit $STATUS

scripts/release-prep.sh

@@ -1,5 +1,10 @@
+. scripts/common.sh
+
 # run tests
 . scripts/pre-release-tests.sh
 
 # update jazzy documentation config
+printf "${GREEN}Updating .jazzy.yml${RESET}\n"
 ./scripts/update-jazzy-config.rb
+exitIfLastStatusWasUnsuccessful
+printf "${GREEN}Successfully updated .jazzy.yml${RESET}\n"

scripts/update-jazzy-config.rb

@@ -2,6 +2,12 @@
 
 require 'yaml'
 
+jazzy_dep = Gem::Dependency.new('jazzy')
+found_jazzy = jazzy_dep.matching_specs
+if found_jazzy.empty?
+  Kernel.abort('jazzy gem not found. Please install it and then try again.')
+end
+
 included_directories = %w(RxSwift RxCocoa)
 
 files_and_directories = included_directories.collect do |directory|