Fixes for blank version

Author: andrjohns

R/install.R

@@ -866,7 +866,8 @@ rtools4x_toolchain_path <- function() {
   if (arch_is_aarch64()) {
     toolchain <- "aarch64-w64-mingw32.static.posix"
   } else {
-    if (rtools4x_version() < "44" || Sys.getenv("CMDSTANR_USE_MSYS_TOOLCHAIN") != "" || cmdstan_version() < "2.35.0") {
+    if (rtools4x_version() < "44" || Sys.getenv("CMDSTANR_USE_MSYS_TOOLCHAIN") != "" ||
+        isTRUE(cmdstan_version(error_on_NA=FALSE) < "2.35.0")) {
       toolchain <- ifelse(is_ucrt_toolchain(), "ucrt64", "mingw64")
     } else {
       toolchain <- "x86_64-w64-mingw32.static.posix"

R/utils.R

@@ -96,7 +96,8 @@ arch_is_aarch64 <- function() {
 make_cmd <- function() {
   if (Sys.getenv("MAKE") != "") {
     Sys.getenv("MAKE")
-  } else if (os_is_windows() && !os_is_wsl() && (rtools4x_version() < "44" || Sys.getenv("CMDSTANR_USE_MSYS_TOOLCHAIN") != "" || cmdstan_version() < "2.35.0")) {
+  } else if (os_is_windows() && !os_is_wsl() &&
+        (rtools4x_version() < "44" || Sys.getenv("CMDSTANR_USE_MSYS_TOOLCHAIN") != "" || isTRUE(cmdstan_version(error_on_NA=FALSE) < "2.35.0"))) {
     "mingw32-make.exe"
   } else {
     "make"