Ignore invalid strings, some models use them for some reason

Author: Pyogenics

io_scene_a3d/A3DObjects.py

@@ -36,6 +36,7 @@ def read2(self, stream):
         print(f"[A3DMaterial name: {self.name} color: {self.color} diffuse map: {self.diffuseMap}]")
 
     def read3(self, stream):
+        print(stream.tell())
         self.name = readLengthPrefixedString(stream)
         self.color = unpackStream("<3f", stream)
         self.diffuseMap = readLengthPrefixedString(stream)

io_scene_a3d/IOTools.py

@@ -33,7 +33,7 @@ def readNullTerminatedString(stream):
     while char != b"\x00":
         string += char
         char = stream.read(1)
-    return string.decode("utf8")
+    return string.decode("utf8", errors="ignore")
 
 def calculatePadding(length):
     # (it basically works with rounding)
@@ -47,4 +47,4 @@ def readLengthPrefixedString(stream):
     paddingSize = calculatePadding(length)
     stream.read(paddingSize)
 
-    return string.decode("utf8")
+    return string.decode("utf8", errors="ignore")