install: handle unbound parameters

lib/helpers.bash

@@ -572,7 +572,7 @@ _bash-it-profile-load-parse-profile() {
 			break
 		fi
 		# Do not actually modify config on dry run
-		[[ -z $2 ]] || continue
+		[[ -z ${2:-} ]] || continue
 		# Actually enable the component
 		$enable_func "$component"
 	done < "$1"
@@ -704,7 +704,9 @@ function _on-disable-callback() {
 	_group 'lib'
 
 	local callback="${1}_on_disable"
-	_command_exists "$callback" && "$callback"
+	if _command_exists "$callback"; then
+		"$callback"
+	fi
 }
 
 function _disable-all() {
@@ -723,8 +725,8 @@ function _disable-plugin() {
 	_example '$ disable-plugin rvm'
 	_group 'lib'
 
-	_disable-thing "plugins" "plugin" "$1"
-	_on-disable-callback "$1"
+	_disable-thing "plugins" "plugin" "${1?}"
+	_on-disable-callback "${1?}"
 }
 
 function _disable-alias() {
@@ -733,7 +735,7 @@ function _disable-alias() {
 	_example '$ disable-alias git'
 	_group 'lib'
 
-	_disable-thing "aliases" "alias" "$1"
+	_disable-thing "aliases" "alias" "${1?}"
 }
 
 function _disable-completion() {
@@ -742,7 +744,7 @@ function _disable-completion() {
 	_example '$ disable-completion git'
 	_group 'lib'
 
-	_disable-thing "completion" "completion" "$1"
+	_disable-thing "completion" "completion" "${1?}"
 }
 
 function _disable-thing() {
@@ -776,7 +778,7 @@ function _disable-thing() {
 		# Either one will be matched by this glob
 		for plugin in "${BASH_IT}/enabled"/[[:digit:]][[:digit:]][[:digit:]]"${BASH_IT_LOAD_PRIORITY_SEPARATOR}${file_entity}.${suffix}.bash" "${BASH_IT}/$subdirectory/enabled/"{[[:digit:]][[:digit:]][[:digit:]]"${BASH_IT_LOAD_PRIORITY_SEPARATOR}${file_entity}.${suffix}.bash","${file_entity}.${suffix}.bash"}; do
 			if [[ -e "${plugin}" ]]; then
-				rm "${plugin}"
+				rm -f "${plugin}"
 				plugin=
 				break
 			fi
@@ -789,8 +791,9 @@ function _disable-thing() {
 
 	_bash-it-clean-component-cache "${file_type}"
 
-	if [[ "$file_entity" = "all" ]]; then
-		printf '%s\n' "$file_entity $(_bash-it-pluralize-component "$file_type") disabled."
+	if [[ "$file_entity" == "all" ]]; then
+		_bash-it-component-pluralize "${file_type}"
+		printf '%s\n' "$file_entity ${_bash_it_component_pluralize?} disabled."
 	else
 		printf '%s\n' "$file_entity disabled."
 	fi