Null values display in overview charts, ticket #168
Null values display in overview charts, ticket #168

aptiko/enhydris,openmeteo/enhydris,ellak-monades-aristeias/enhydris,kickapoo/enhydris,ellak-monades-aristeias/enhydris,aptiko/enhydris,kickapoo/enhydris,openmeteo/enhydris,ellak-monades-aristeias/enhydris,aptiko/enhydris,openmeteo/enhydris,kickapoo/enhydris