Fix similar issues with ValueTo* methods in the input framework

testing/btest/scripts/base/frameworks/input/missing-table-value.zeek

@@ -0,0 +1,35 @@
+# @TEST-EXEC: btest-bg-run zeek zeek -b %INPUT
+# @TEST-EXEC: btest-bg-wait 10
+# @TEST-EXEC: btest-diff zeek/.stderr
+# @TEST-EXEC: btest-diff zeek/.stdout
+
+@TEST-START-FILE denylist.txt
+#separator \x09
+#fields	ip	colors
+192.168.17.1	Red,White
+192.168.27.2	White,asdf
+192.168.250.3	Blue
+@TEST-END-FILE
+
+# test.zeek
+type Idx: record {
+    ip: addr;
+};
+
+type Color: enum { Red, White, Blue, };
+
+type Val: record {
+    colors: set[Color];
+};
+
+global denylist: table[addr] of Val = table();
+
+event zeek_init() {
+    Input::add_table([$source="../denylist.txt", $name="denylist",
+                      $idx=Idx, $val=Val, $destination=denylist]);
+    Input::remove("denylist");
+}
+
+event Input::end_of_data(name: string, source: string) {
+    print denylist;
+}