Added error handling around the sourcing of primary scripts when load…

…ing RVM.

scripts/rvm

@@ -53,14 +53,13 @@ if [[ $rvm_loaded_flag -eq 0 || $rvm_reload_flag -eq 1 ]] ; then
   rvm_scripts_path="${rvm_scripts_path:-"$rvm_path/scripts"}"
 
   if [[ -d "$rvm_path" ]] ; then
-    source "$rvm_scripts_path/array"
-    source "$rvm_scripts_path/utility"
-    source "$rvm_scripts_path/initialize"
-    source "$rvm_scripts_path/version"
-    source "$rvm_scripts_path/selector"
-    source "$rvm_scripts_path/cli"
-    source "$rvm_scripts_path/cd"
-    source "$rvm_scripts_path/override_gem"
+    for script in array utility initialize version selector cli cd override_gem ; do
+      if [[ -f "$rvm_scripts_path/$script" ]] ; then
+        source "$rvm_scripts_path/$script"
+      else
+        "$rvm_scripts_path/log" "error" "RVM: Could not source script '$rvm_scripts_path/$script', file does not exist. RVM will likely not work as expected."
+      fi
+    done
 
     rvm_loaded_flag=1