get_truth_path builds a wrong file path when querying a local repo

[cjgb]

I am using

truth_cases <- load_truth(
truth_source = "JHU",
target_variable = "inc case",
locations = c("US", state.name),
data_location = "local_hub_repo",
local_repo_path = "../covid19-forecast-hub")

to get cases data from my local hub clone. But the command fails because function get_truth_path is not building the required file path correctly. In fact, it is building

'../covid19-forecast-hub/data-truth/truth-/Incident Cases.csv'

whereas the right location is

'../covid19-forecast-hub/data-truth/truth-Incident Cases.csv'

I tracked down the issue to line 466 in load_truth.R, where it currently reads

file_path <- file.path(repo_path, truth_folder_path, file_name)

but a paste should be used instead (as for the part that downloads the remote repo data).