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			I assume you got a "invalid literal for int() with base 10: ' '" error.  Which is perfectly true--it's not. 
 
And knowing you, I doubt you'll happy with the easy answer: Use "0". 
 
FFF deliberately skips setting custom int/float columns to empty string values ('').  Probably to 'do the right thing' on update when a user has manually populated a column with a value that particular story or site doesn't have.  Which makes me reluctant to change the existing behavior.   
 
How many other people would find the ability to explicitly set a column to empty string (or None, which appears equivalent) useful? 
 
Or would prefer if empty metadata values in general would also blank int/float instead of leave them?
		 
		
	
		
		
		
		
		
		
		
		
		
		
	
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