utitilities: Add NVRAM error handling

CHANGELOG.md

@@ -4,6 +4,7 @@
 - Ensure Apple Silicon-specific installers are not listed
   - ie. M2 specific build (21F2092)
 - Avoid adding OpenCore icon in boot picker if Windows bootloader on same partition
+- Add error-handling to corrupt/non-standard NVRAM variables
 
 ## 0.4.7
 - Fix crashing on defaults parsing

resources/utilities.py

@@ -346,7 +346,12 @@ def get_nvram(variable: str, uuid: str = None, *, decode: bool = False):
 
     if decode:
         if isinstance(value, bytes):
-            value = value.strip(b"\0").decode()
+            try:
+                value = value.strip(b"\0").decode()
+            except UnicodeDecodeError:
+                # Some sceanrios the firmware will throw garbage in
+                # ie. iMac12,2 with FireWire boot-path
+                value = None
         elif isinstance(value, str):
             value = value.strip("\0")
     return value