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Improve error arising from fully commented-out TeX strings.

Currently, `figtext(.5, .5, "%foo", usetex=True)` results in an obscureexception (`FileNotFoundError: No such file or directory: blah.dvi`).Best would be to force TeX to always generate a page even if the stringis "empty" (from TeX's PoV), but in the meantime, at least log a warningto make the situation slightly less confusing.

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lib/matplotlib
- dviread.py

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`‎lib/matplotlib/dviread.py`

Lines changed: 9 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -196,7 +196,15 @@ def __init__(self, filename, dpi):`
`196`	`196`	`Use None to return TeX's internal units.`
`197`	`197`	`"""`
`198`	`198`	`_log.debug('Dvi: %s',filename)`
`199`		`-self.file=open(filename,'rb')`
	`199`	`+try:`
	`200`	`+self.file=open(filename,'rb')`
	`201`	`+exceptFileNotFoundError:`
	`202`	`+# This warning should go away once we fix texmanager to always`
	`203`	`+# create a dvi file, even if it is empty.`
	`204`	`+_log.warning(`
	`205`	`+'%s does not exist; this may arise from processing an empty '`
	`206`	`+'or fully commented-out TeX string.',filename)`
	`207`	`+raise`
`200`	`208`	`self.dpi=dpi`
`201`	`209`	`self.fonts= {}`
`202`	`210`	`self.state=_dvistate.pre`

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Commitae6e943

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`‎lib/matplotlib/dviread.py`

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