Setting project metadata doesn't work if no metadata is specified at project creation.

[Andrew0Hill]

When creating a project with no metadata, attempts to set metadata via the set_* calls will fail since the metadata file is not created.

Steps to replicate:

1. Create default project using CIDAtools::create_project() but do not specify any metadata field (analyst, pi, etc).
2. Run CIDAtools::set_project_analyst("foo")

This occurs because create_project only builds a metadata file if the metadata is specified:

CIDAtools/R/create_project.R

Lines 31 to 32 in b79ee5b

	# has meta been provided?
	meta <- !all(c(ProjectName, PI, analyst, datalocation) %in% "")

CIDAtools/R/create_project.R

Lines 70 to 76 in b79ee5b

	if(meta){
	dir.create(paste0(path, '/.ProjData'))
	ProjData <- list(ProjectName = ProjectName, PI = PI,
	analyst = analyst, datalocation = datalocation,
	gitlocation = gitlocation)
	write.dcf(ProjData, file.path(path, '/.ProjData/Data.dcf'))
	}

We need to either always create the metadata file or have calls to set_* call a function to first create the metadata file instead.