fix(_comp_finalize): fix test errors

Author: akinomyoga

bash_completion

@@ -954,8 +954,11 @@ _comp_finalize()
     while ((${#FUNCNAME[@]} <= ${_comp_finalize__depth[-1]})); do
         if ((${#FUNCNAME[@]} == ${_comp_finalize__depth[-1]})); then
             # Call finalizer for each command
-            local __comp_hook=${BASH_COMPLETION_FINALIZE_CMD_HOOKS[${words[0]-}]-}
-            eval -- "$__comp_hook"
+            local cmd=${words[0]-}
+            if [[ $cmd ]]; then
+                local __comp_hook=${BASH_COMPLETION_FINALIZE_CMD_HOOKS[$cmd]-}
+                eval -- "$__comp_hook"
+            fi
 
             # Call general finalizers
             if ((${#BASH_COMPLETION_FINALIZE_HOOKS[@]})); then
@@ -997,25 +1000,27 @@ _init_completion()
 {
     local exclude="" flag outx errx inx OPTIND=1
 
-    # Install "_comp_finalize" to the RETURN trap when "_init_completion" is
-    # called for the top-level completion. [ Note: the completion function may
-    # be called recursively using "_command_offset", etc. ]
-    if ((${#_comp_finalize__depth[@]} == 0)); then
-        if shopt -q extdebug || shopt -qo functrace; then
-            # If extdebug / functrace is set, we need to explicitly save and
-            # restore the original trap handler because the outer trap handlers
-            # will be affected by "trap - RETURN" inside functions with these
-            # settings.
-            _comp_finalize__original_return_trap=$(trap -p RETURN)
-        else
-            # Otherwise, the outer RETURN trap will be restored when the RETURN
-            # trap is removed inside the functions using "trap - RETURN".  So, we
-            # do not need to explicitly save the outer trap handler.
-            _comp_finalize__original_return_trap=
+    if ((${#FUNCNAME[@]} >= 2)); then
+        # Install "_comp_finalize" to the RETURN trap when "_init_completion" is
+        # called for the top-level completion. [ Note: the completion function may
+        # be called recursively using "_command_offset", etc. ]
+        if ((${#_comp_finalize__depth[@]} == 0)); then
+            if shopt -q extdebug || shopt -qo functrace; then
+                # If extdebug / functrace is set, we need to explicitly save and
+                # restore the original trap handler because the outer trap handlers
+                # will be affected by "trap - RETURN" inside functions with these
+                # settings.
+                _comp_finalize__original_return_trap=$(trap -p RETURN)
+            else
+                # Otherwise, the outer RETURN trap will be restored when the RETURN
+                # trap is removed inside the functions using "trap - RETURN".  So, we
+                # do not need to explicitly save the outer trap handler.
+                _comp_finalize__original_return_trap=
+            fi
+            trap _comp_finalize RETURN
         fi
-        trap _comp_finalize RETURN
+        _comp_finalize__depth+=(${#FUNCNAME[@]})
     fi
-    _comp_finalize__depth+=(${#FUNCNAME[@]})
 
     while getopts "n:e:o:i:s" flag "$@"; do
         case $flag in