Exit 0 without copying when target directories are not set

This way, CocoaPods does not have to make assumptions about when to copy things, as the user can then set FRAMEWORKS_FOLDER_PATH / UNLOCALIZED_RESOURCES_FOLDER_PATH for static library targets

lib/cocoapods/generator/copy_resources_script.rb

@@ -99,6 +99,12 @@ set -e
 set -u
 set -o pipefail
 
+if [ -z ${UNLOCALIZED_RESOURCES_FOLDER_PATH+x} ]; then
+    # If UNLOCALIZED_RESOURCES_FOLDER_PATH is not set, then there's no where for us to copy
+    # resources to, so exit 0 (signalling the script phase was successful).
+    exit 0
+fi
+
 mkdir -p "${TARGET_BUILD_DIR}/${UNLOCALIZED_RESOURCES_FOLDER_PATH}"
 
 RESOURCES_TO_COPY=${PODS_ROOT}/resources-to-copy-${TARGETNAME}.txt

lib/cocoapods/generator/embed_frameworks_script.rb

@@ -40,6 +40,12 @@ module Pod
           set -u
           set -o pipefail
 
+          if [ -z ${FRAMEWORKS_FOLDER_PATH+x} ]; then
+              # If FRAMEWORKS_FOLDER_PATH is not set, then there's no where for us to copy
+              # frameworks to, so exit 0 (signalling the script phase was successful).
+              exit 0
+          fi
+
           echo "mkdir -p ${CONFIGURATION_BUILD_DIR}/${FRAMEWORKS_FOLDER_PATH}"
           mkdir -p "${CONFIGURATION_BUILD_DIR}/${FRAMEWORKS_FOLDER_PATH}"