Incremented version to 7.1.3

This was causing an error for some people because of the bizarre
behavior around `getattr` and `setattr` in `bpy.ops` always reporting
that the BDK was installed.

io_scene_psk_psa/blender_manifest.toml

@@ -1,6 +1,6 @@
 schema_version = "1.0.0"
 id = "io_scene_psk_psa"
-version = "7.1.2"
+version = "7.1.3"
 name = "Unreal PSK/PSA (.psk/.psa)"
 tagline = "Import and export PSK and PSA files used in Unreal Engine"
 maintainer = "Colin Basnett <cmbasnett@gmail.com>"

io_scene_psk_psa/psa/builder.py

@@ -155,7 +155,7 @@ def build_psa(context: bpy.types.Context, options: PsaBuildOptions) -> Psa:
         # Calculate the frame step based on the compression factor.
         frame_extents = abs(frame_end - frame_start)
         frame_count_raw = frame_extents + 1
-        frame_count = max(export_sequence.key_quota, int(frame_count_raw * export_sequence.compression_ratio))
+        frame_count = max(1, max(export_sequence.key_quota, int(frame_count_raw * export_sequence.compression_ratio)))
 
         try:
             frame_step = frame_extents / (frame_count - 1)

io_scene_psk_psa/shared/helpers.py

@@ -164,4 +164,4 @@ def get_export_bone_names(armature_object: Object, bone_filter_mode: str, bone_c
 
 
 def is_bdk_addon_loaded() -> bool:
-    return bpy.ops.bdk is not None and bpy.ops.bdk.link_material is not None
+    return 'bdk' in dir(bpy.ops)