did some validation for sending text messages: can't send to no one and message can't be empty
did some validation for sending text messages: can't send to no one and message can't be empty

puttarajubr/commcare-hq,SEL-Columbia/commcare-hq,dimagi/commcare-hq,gmimano/commcaretest,dimagi/commcare-hq,dimagi/commcare-hq,puttarajubr/commcare-hq,qedsoftware/commcare-hq,qedsoftware/commcare-hq,puttarajubr/commcare-hq,qedsoftware/commcare-hq,SEL-Columbia/commcare-hq,gmimano/commcaretest,dimagi/commcare-hq,dimagi/commcare-hq,puttarajubr/commcare-hq,qedsoftware/commcare-hq,qedsoftware/commcare-hq,SEL-Columbia/commcare-hq,gmimano/commcaretest