reduced unecessary installer cannot stat warnings

update-chunkymap-installer-only.sh

@@ -7,7 +7,9 @@ if [ ! -d "$HOME/Downloads" ]; then
 fi
 
 cd $HOME/Downloads
+if [ -f master.zip ]; then
   rm master.zip
+fi
 wget https://github.com/expertmm/minetest-chunkymap/archive/master.zip
 rm -f minetest-chunkymap.zip
 mv master.zip minetest-chunkymap.zip

update-chunkymap-on-ubuntu-from-web.sh

@@ -9,7 +9,10 @@ fi
 #cd $CHUNKYMAP_INSTALLER_DIR
 chmod +x update-chunkymap-installer-only.sh
 cd $HOME/Downloads
+if [ -f "update-chunkymap-installer-only.sh" ]; then
+  # move misplaced file from older versions:
   mv -f update-chunkymap-installer-only.sh "$CHUNKYMAP_INSTALLER_DIR/update-chunkymap-installer-only.sh"
+fi
 sh "$CHUNKYMAP_INSTALLER_DIR/update-chunkymap-installer-only.sh"
 #./install-chunkymap-on-ubuntu.sh
 chmod +x "$CHUNKYMAP_INSTALLER_DIR/install-chunkymap-on-ubuntu.sh"