Don't add non-existing paths (provided by MNS)

Author: Flamefire

easybuild/framework/easyblock.py

@@ -2155,7 +2155,7 @@ def prepare_step(self, start_dir=True, load_tc_deps_modules=True):
         curr_modpaths = curr_module_paths()
         for init_modpath in init_modpaths:
             full_mod_path = os.path.join(self.installdir_mod, init_modpath)
-            if full_mod_path not in curr_modpaths:
+            if os.path.exists(full_mod_path) and full_mod_path not in curr_modpaths:
                 self.modules_tool.prepend_module_path(full_mod_path)
 
         # prepare toolchain: load toolchain module and dependencies, set up build environment

easybuild/tools/modules.py

@@ -672,7 +672,8 @@ def load(self, modules, mod_paths=None, purge=False, init_env=None, allow_reload
         # extend $MODULEPATH if needed
         for mod_path in mod_paths:
             full_mod_path = os.path.join(install_path('mod'), build_option('suffix_modules_path'), mod_path)
-            self.prepend_module_path(full_mod_path)
+            if os.path.exists(full_mod_path):
+                self.prepend_module_path(full_mod_path)
 
         loaded_modules = self.loaded_modules()
         for mod in modules:

easybuild/tools/toolchain/toolchain.py

@@ -634,7 +634,9 @@ def _load_toolchain_module(self, silent=False):
             if self.init_modpaths:
                 mod_path_suffix = build_option('suffix_modules_path')
                 for modpath in self.init_modpaths:
-                    self.modules_tool.prepend_module_path(os.path.join(install_path('mod'), mod_path_suffix, modpath))
+                    modpath = os.path.join(install_path('mod'), mod_path_suffix, modpath)
+                    if os.path.exists(modpath):
+                        self.modules_tool.prepend_module_path(modpath)
 
             # load modules for all dependencies
             self.log.debug("Loading module for toolchain: %s", tc_mod)