self-diagnostics: Fix rpcd scripts

self-diagnostics/Makefile

@@ -1,7 +1,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=self-diagnostics
-PKG_VERSION:=1.0.8
+PKG_VERSION:=1.0.9
 PKG_RELEASE:=1
 
 PKG_LICENSE:=GPL-2.0-only

self-diagnostics/files/usr/libexec/rpcd/self-diagnostics

@@ -11,17 +11,28 @@ case "$1" in
 		case "$2" in
 			generate)
 				read -t 1 -r input
+				local out
 
 				json_load "${input}"
 				json_get_var modules modules
 				if [ -z "${modules}" ]; then
-					${BIN} -j
+					out="$(${BIN} -j)"
 				else
-					${BIN} -j -m "${modules}"
+					out="$(${BIN} -j -m "${modules}")"
+				fi
+				if [ -z "${out}" ]; then
+					echo '{}'
+				else
+					echo "${out}"
 				fi
 			;;
 			list)
-				${BIN} -j -l
+				out="$(${BIN} -j -l)"
+				if [ -z "${out}" ]; then
+					echo '{}'
+				else
+					echo "${out}"
+				fi
 			;;
 		esac
 	;;