Clamp Volumetric Fog Length property to prevent rendering issues

A length of 0 units doesn't make sense anyway.

(cherry picked from commit 8041cff8655d017243a5756bb62751bd60accc5b)

scene/resources/environment.cpp

@@ -1449,7 +1449,7 @@ void Environment::_bind_methods() {
 	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "volumetric_fog_emission_energy", PROPERTY_HINT_RANGE, "0,1024,0.01,or_greater"), "set_volumetric_fog_emission_energy", "get_volumetric_fog_emission_energy");
 	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "volumetric_fog_gi_inject", PROPERTY_HINT_RANGE, "0.0,16,0.01,exp"), "set_volumetric_fog_gi_inject", "get_volumetric_fog_gi_inject");
 	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "volumetric_fog_anisotropy", PROPERTY_HINT_RANGE, "-0.9,0.9,0.01"), "set_volumetric_fog_anisotropy", "get_volumetric_fog_anisotropy");
-	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "volumetric_fog_length", PROPERTY_HINT_RANGE, "0,1024,0.01,or_greater"), "set_volumetric_fog_length", "get_volumetric_fog_length");
+	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "volumetric_fog_length", PROPERTY_HINT_RANGE, "0.01,1024,0.01,or_greater,suffix:m"), "set_volumetric_fog_length", "get_volumetric_fog_length");
 	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "volumetric_fog_detail_spread", PROPERTY_HINT_EXP_EASING, "positive_only"), "set_volumetric_fog_detail_spread", "get_volumetric_fog_detail_spread");
 	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "volumetric_fog_ambient_inject", PROPERTY_HINT_RANGE, "0.0,16,0.01,exp"), "set_volumetric_fog_ambient_inject", "get_volumetric_fog_ambient_inject");
 	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "volumetric_fog_sky_affect", PROPERTY_HINT_RANGE, "0,1,0.001"), "set_volumetric_fog_sky_affect", "get_volumetric_fog_sky_affect");