$ make V=1
if ! test -d "hu/"; then mkdir "hu/"; fi
if test -d "C"; then d="../"; else d="/home/chpe/source/git/gnome-terminal/build/../help/"; fi; \
mo="hu/hu.mo"; \
if test -f "${mo}"; then mo="../${mo}"; else mo="/home/chpe/source/git/gnome-terminal/build/../help/${mo}"; fi; \
(cd "hu/" && itstool -m "${mo}" ${d}/C/adv-keyboard-shortcuts.page ${d}/C/app-colors.page ${d}/C/app-cursor.page ${d}/C/app-fonts.page ${d}/C/app-fullscreen.page ${d}/C/app-terminal-sizes.page ${d}/C/app-zoom.page ${d}/C/gs-execute-commands.page ${d}/C/gs-tabs.page ${d}/C/index.page ${d}/C/introduction.page ${d}/C/legal.xml ${d}/C/overview.page ${d}/C/pref.page ${d}/C/pref-bell.page ${d}/C/pref-custom-exit.page ${d}/C/pref-custom-command.page ${d}/C/pref-encoding.page ${d}/C/pref-keyboard-access.page ${d}/C/pref-menubar.page ${d}/C/pref-profiles.page ${d}/C/pref-scrolling.page ${d}/C/pref-title.page ${d}/C/profile.page ${d}/C/txt-copy-paste.page ${d}/C/txt-links.page ${d}/C/txt-search.page ${d}/C/txt-select-text.page) && \
touch "hu/hu.stamp"
Error: Could not merge translations:
'NoneType' object has no attribute 'node'
make: *** [hu/hu.stamp] Fehler 1


I've temporarily removed 'hu' from HELP_LINGUAS on gnome-3-10 branch; once you fix this please re-add it. And please also check if master is also affected by this.