fix hunger status highlighting text match

Crash triggered by fuzzer.

The Null value for not-hungry between "Satiated" and "Hungry" in the
array of possible hunger states caused a crash if C++ regex handling
was being used.  With posixregex, it would pass benignly for tty but
crash for curses.  I didn't check any other interface.

doc/fixes3-7-0.txt

@@ -1467,6 +1467,10 @@ when a secret corridor was discovered by wand of secret door detection or by
 	forgotten unless within range of a light source
 when poly'd into a giant, kicking a closed door always succeeds in breaking it
 reduce crystal plate mail weight
+interactively setting a status highlight for hunger with 'O' and choosing
+	'text match' could crash while setting up the menu of hunger status
+	value strings; happened for curses or if the program was built to
+	use C++ regex processing but not for tty+posixregex
 
 
 Fixes to 3.7.0-x General Problems Exposed Via git Repository

src/botl.c

@@ -2502,6 +2502,8 @@ query_arrayvalue(
     start_menu(tmpwin, MENU_BEHAVE_STANDARD);
 
     for (i = arrmin; i < arrmax; i++) {
+        if (!arr[i])  /* the array of hunger status values has a gap ...*/
+            continue; /*... set to Null between Satiated and Hungry     */
         any = cg.zeroany;
         any.a_int = i + adj;
         add_menu(tmpwin, &nul_glyphinfo, &any, 0, 0, ATR_NONE,

src/windows.c

@@ -1797,6 +1797,12 @@ add_menu(
     const char *str,            /* menu text */
     unsigned int itemflags)     /* itemflags such as MENU_ITEMFLAGS_SELECTED */
 {
+    if (!str) {
+        /* if 'str' is Null, just return without adding any menu entry */
+        debugpline0("add_menu(Null)");
+        return;
+    }
+
     if (iflags.use_menu_color) {
         if ((itemflags & MENU_ITEMFLAGS_SKIPMENUCOLORS) == 0)
             (void) get_menu_coloring(str, &color, &attr);