fixed warnings in describe_collection (#145))

fixed warning messages shown on `describe_collection()` using an object of class `Collection` from `list_collection()` [#145](#145)

NEWS.md

@@ -11,7 +11,8 @@
 * CollectionId argument now checks if a string pattern is available
 * OutputFormat argument checks the "FileFormat" class separately to avoid warnings
 * fixed automated selection of a suitable OIDC provider on login [#142](https://github.com/Open-EO/openeo-r-client/issues/142), where the first OIDC in the list was chosen. Now it checks for the first OIDC provider with `default_clients` defined.
-* fixed tan issue where it was not possible to connect to an openEO back-end with a dedicated link (also for reconnect in the connection contract)
+* fixed an issue where it was not possible to connect to an openEO back-end with a dedicated link (also for reconnect in the connection contract)
+* fixed warning messages shown on `describe_collection()` using an object of class `Collection` from `list_collection()` [#145](https://github.com/Open-EO/openeo-r-client/issues/145)
 * .create_sample_bbox interpretes now correctly a serialized extent object
 * .find_process_by_name is no longer giving a false message when a process is passed to it
 

R/collections.R

@@ -95,7 +95,7 @@ describe_collection = function(collection = NA, con=NULL) {
         return(NULL)
     })
 
-    missing_collection = missing(collection) || length(collection) == 0 || is.na(collection) || nchar(collection) == 0
+    missing_collection = !(length(collection) > 0 && any(!is.na(collection)) && !(is.character(collection) && length(collection) == 1 && nchar(collection) > 0))
 
     if (missing_collection) {
         message("No or invalid collection id(s)")