Update error messaging for invalid queries

[vsriram24]

I tried to collect incidence data for all counties in Washington using the incidence_cancer(). I received an error in mutate(), stating that a data frame with 'NA' or empty names cannot be transformed. Either these situations should be accounted for, or a more informative error message should be generated to handle such a call.

Example code:
cancerprof::incidence_cancer( area = "wa", areatype = "county", cancer = "all cancer sites", race = "All Races (includes Hispanic)", sex = "both sexes", age = "all ages", stage = "all stages", year = "latest 5 year average" )

Error message:
Error in mutate(): ! Can't transform a data frame with NAor""` names.
Backtrace:

1. cancerprof::incidence_cancer(...)
2. dplyr:::mutate.data.frame(...)
   Error in mutate(., across(c(all_of(shared_names_to_numeric), "Recent_5_Year_Trend",`