fix 'list_new_cran_updates' for #56 when no new updates

DESCRIPTION

@@ -1,6 +1,6 @@
 Package: pkgstats
 Title: Metrics of R Packages
-Version: 0.1.5.026
+Version: 0.1.5.027
 Authors@R: 
     person("Mark", "Padgham", , "[email protected]", role = c("aut", "cre"),
            comment = c(ORCID = "0000-0003-2172-5265"))

R/cran-data-update.R

@@ -161,8 +161,11 @@ list_new_cran_updates <- function (prev_results) {
     cran_tarball <- paste0 (cran_pkgs$Package, "_", cran_pkgs$Version)
 
     cran_pkgs <- cran_pkgs [which (!cran_tarball %in% prev_tarball), ]
-    paste0 (cran_pkgs$Package, "_", cran_pkgs$Version)
-
+    ret <- character (0L)
+    if (nrow (cran_pkgs) > 0) {
+        ret <- paste0 (cran_pkgs$Package, "_", cran_pkgs$Version)
+    }
+    return (ret)
 }
 
 one_summary_from_cran <- function (i,

codemeta.json

@@ -8,7 +8,7 @@
   "codeRepository": "https://github.com/ropensci-review-tools/pkgstats",
   "issueTracker": "https://github.com/ropensci-review-tools/pkgstats/issues",
   "license": "https://spdx.org/licenses/GPL-3.0",
-  "version": "0.1.5.026",
+  "version": "0.1.5.027",
   "programmingLanguage": {
     "@type": "ComputerLanguage",
     "name": "R",