fix affect_allies can have 3 value true,false and noexistent

when abilities don't have affect_allies implemented, then onlyunit same side are affected, if affect_allies=yes, unit of allied side inclus and if falsethen none unit allied or same side are affected.

data/schema/filters/abilities.cfg

@@ -14,7 +14,7 @@
 	{SIMPLE_KEY divide s_real_range_list}
 	{SIMPLE_KEY affect_adjacent s_bool}
 	{SIMPLE_KEY affect_self s_bool}
-	{SIMPLE_KEY affect_allies s_bool}
+	{SIMPLE_KEY affect_allies bool_or_empty}
 	{SIMPLE_KEY affect_enemies s_bool}
 	{FILTER_BOOLEAN_OPS abilities}
 [/tag]

data/schema/game_config.cfg

@@ -40,6 +40,14 @@
         name="ability_overwrite"
         value="none|one_side|both_sides"
     [/type]
+    [type]
+        name="bool_or_empty"
+        [list]
+            [element]
+                value="true|false|yes|no|empty"
+            [/element]
+        [/list]
+    [/type]
     [type]
         name="addon_type"
         value="sp|mp|hybrid"
@@ -423,6 +431,7 @@
     {SUBST_TYPE anim_hits}
     {SUBST_TYPE f_int}
     {SUBST_TYPE alignment}
+	{SUBST_TYPE bool_or_empty}
     [type]
         name="global"
         value="global"

src/units/unit.cpp

@@ -1435,7 +1435,7 @@ static bool matches_ability_filter(const config & cfg, const std::string& tag_na
 	if(!bool_matches_if_present(filter, cfg, "affect_self", true))
 		return false;
 
-	if(!bool_matches_if_present(filter, cfg, "affect_allies", true))
+	if(!bool_or_empty(filter, cfg, "affect_allies"))
 		return false;
 
 	if(!bool_matches_if_present(filter, cfg, "affect_enemies", false))

src/utils/config_filters.cpp

@@ -98,3 +98,26 @@ bool utils::config_filters::double_matches_if_present(const config& filter, cons
 	double value_def = def ? (*def) : 1;
 	return in_ranges<double>(cfg[attribute].to_double(value_def), utils::parse_ranges_real(filter[attribute].str()));
 }
+
+bool utils::config_filters::bool_or_empty(const config& filter, const config& cfg, const std::string& attribute)
+{
+	if(filter[attribute].blank()) {
+		return true;
+	}
+
+	std::set<std::string> filter_attribute = utils::split_set(filter[attribute].str());
+	bool is_matches = false;
+	if(cfg.has_attribute(attribute)){
+		if(filter_attribute.count("yes") != 0 || filter_attribute.count("true") != 0){
+			is_matches = cfg[attribute].to_bool();
+		}
+		if(!is_matches && (filter_attribute.count("no") != 0 || filter_attribute.count("false") != 0)){
+			is_matches = !cfg[attribute].to_bool();
+		}
+	} else {
+		if(filter_attribute.count("empty") != 0){
+			is_matches = true;
+		}
+	}
+	return is_matches;
+}

src/utils/config_filters.hpp

@@ -67,4 +67,6 @@ bool int_matches_if_present_or_negative(
 bool string_matches_if_present(
 	const config& filter, const config& cfg, const std::string& attribute, const std::string& def);
 
+bool bool_or_empty(const config& filter, const config& cfg, const std::string& attribute);
+
 } // namespace utils::config_filters