Use "set -o nounset" in bash scripts

* admin/automerge:
* admin/make-manuals:
* admin/update-copyright:
* admin/update_autogen:
* admin/upload-manuals: Use "set -o nounset".

admin/automerge

@@ -35,6 +35,8 @@
 ## it with the -d option in the repository directory, in case a pull
 ## updates this script while it is working.
 
+set -o nounset
+
 die ()                 # write error to stderr and exit
 {
     [ $# -gt 0 ] && echo "$PN: $*" >&2

admin/make-manuals

@@ -33,6 +33,8 @@
 
 ### Code:
 
+set -o nounset
+
 die ()                          # write error to stderr and exit
 {
     [ $# -gt 0 ] && echo "$PN: $@" >&2

admin/update-copyright

@@ -31,6 +31,8 @@
 # updated and some should not be, due to registration numbers, so
 # this script leaves these copyright years alone for now.
 
+set -o nounset
+
 : ${UPDATE_COPYRIGHT_USE_INTERVALS=1}
 export UPDATE_COPYRIGHT_USE_INTERVALS
 

admin/update_autogen

@@ -32,6 +32,8 @@
 
 ### Code:
 
+set -o nounset
+
 die ()                 # write error to stderr and exit
 {
     [ $# -gt 0 ] && echo "$PN: $@" >&2

admin/upload-manuals

@@ -36,6 +36,7 @@
 
 ### Code:
 
+set -o nounset
 
 die ()                          # write error to stderr and exit
 {