Update coreclr_errors script

Author: filmor

clr_loader/util/coreclr_errors.py

@@ -26,15 +26,24 @@ def get_coreclr_error(hresult: int) -> Optional[ClrError]:
     from xml.etree import ElementTree
 
     if len(argv) < 2:
-        url = "https://raw.githubusercontent.com/dotnet/coreclr/master/src/inc/corerror.xml"
+        # Download corerror.xml if it was not passed as an argument
+
+        from urllib.request import urlopen
+
         print(
-            f"Please download corerror.xml from {url} and pass as an argument to this script"
+            "No filename passed, downloading corerror.xml from the dotnet/coreclr repository..."
         )
-        exit(1)
+        url = "https://raw.githubusercontent.com/dotnet/coreclr/master/src/inc/corerror.xml"
+        f = urlopen(url)
+    else:
+        f = open(argv[1], "r")
 
-    tree = ElementTree.parse(argv[1])
+    tree = ElementTree.parse(f)
 
-    print(f"Parsed {argv[1]}, updating {__file__}...")
+    if hasattr(f, "close"):
+        f.close()
+
+    print(f"Parsed data, updating {__file__}...")
 
     marker = "# == Autogenerated from corerror.xml =="
 
@@ -51,7 +60,11 @@ def get_coreclr_error(hresult: int) -> Optional[ClrError]:
     for row in tree.findall(".//HRESULT"):
         try:
             numeric_value = int(row.attrib["NumericValue"], base=16)
+        except ValueError:
+            print("Failed to parse numeric value:", row.attrib["NumericValue"])
+            continue
 
+        try:
             for child in row:
                 if child.text:
                     text = child.text.strip(' "')