Flamenco exclusion filter requires BAM 1.1.7; this is now checked

A warning is shown in the GUI when a BAM version that's too old is used
(instead of simply crashing when an exclusion filter was specified).

blender_cloud/blender.py

@@ -426,6 +426,8 @@ class BlenderCloudPreferences(AddonPreferences):
                          text='Local Cloud Project Path')
 
     def draw_flamenco_buttons(self, flamenco_box, bcp: flamenco.FlamencoManagerGroup, context):
+        from .flamenco import bam_interface
+
         header_row = flamenco_box.row(align=True)
         header_row.label('Flamenco:', icon_value=icon('CLOUD'))
 
@@ -461,7 +463,15 @@ class BlenderCloudPreferences(AddonPreferences):
         props = path_box.operator('flamenco.explore_file_path', text='', icon='DISK_DRIVE')
         props.path = self.flamenco_job_output_path
 
-        job_output_box.prop(self, 'flamenco_exclude_filter')
+        show_warning = bool(self.flamenco_exclude_filter and
+                            not bam_interface.bam_supports_exclude_option())
+        job_output_box.alert = show_warning
+        job_output_box.prop(self, 'flamenco_exclude_filter',
+                            icon='ERROR' if show_warning else 'NONE')
+        if show_warning:
+            job_output_box.label(
+                text='Warning, the exclusion filter requires a newer version of Blender!')
+        job_output_box.alert = False
 
         prop_split = job_output_box.split(0.32, align=True)
         prop_split.label('Strip Components:')