Add range check during raster

[deepak786]

There are the following non-fatal exceptions in the Firebase crashlytics:

Non-fatal Exception: io.flutter.plugins.firebase.crashlytics.FlutterError
RangeError (start): Invalid value: Not in inclusive range 0..1: 2. Error thrown while rastering a PDF.

Non-fatal Exception: io.flutter.plugins.firebase.crashlytics.FlutterError
RangeError (length): Invalid value: Valid value range is empty: 0. Error thrown while rastering a PDF.

So added a check before the removeRange.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 8 lines in your changes missing coverage. Please review.

Project coverage is 36.26%. Comparing base (90ad768) to head (3dc8f99).
Report is 92 commits behind head on master.

Files	Patch %	Lines
printing/lib/src/preview/raster.dart	0.00%	8 Missing ⚠️

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1446   +/-   ##
=======================================
  Coverage   36.25%   36.26%           
=======================================
  Files         140      140           
  Lines       21644    21643    -1     
=======================================
  Hits         7848     7848           
+ Misses      13796    13795    -1     

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[deepak786]

Not sure how to resolve the below error

RangeError (length): Invalid value: Valid value range is empty: 0. Error thrown while rastering a PDF.

Report

Non-fatal Exception: io.flutter.plugins.firebase.crashlytics.FlutterError: RangeError (length): Invalid value: Valid value range is empty: 2. Error thrown while rastering a PDF.
(PdfPreviewRaster._raster [framework.dart:925]) (BuildId: 349b900323bc41a5af40333a09cbd634)
(_SuspendState._createAsyncStarCallback.<anonymous closure> [async_patch.dart:379]) (BuildId: 349b900323bc41a5af40333a09cbd634)
(_FutureListener.handleValue [zone.dart:1661]) (BuildId: 349b900323bc41a5af40333a09cbd634)
(Future._propagateToListeners.handleValueCallback [future_impl.dart:784]) (BuildId: 349b900323bc41a5af40333a09cbd634)
(Future._propagateToListeners [future_impl.dart:813]) (BuildId: 349b900323bc41a5af40333a09cbd634)
(Future._completeWithValue [future_impl.dart:584]) (BuildId: 349b900323bc41a5af40333a09cbd634)
(_SuspendState._returnAsyncNotFuture [async_patch.dart:365]) (BuildId: 349b900323bc41a5af40333a09cbd634)
(_SuspendState._createAsyncStarCallback.<anonymous closure> [async_patch.dart:379]) (BuildId: 349b900323bc41a5af40333a09cbd634)
(_FutureListener.handleValue [zone.dart:1661]) (BuildId: 349b900323bc41a5af40333a09cbd634)
(Future._propagateToListeners.handleValueCallback [future_impl.dart:784]) (BuildId: 349b900323bc41a5af40333a09cbd634)
(Future._propagateToListeners [future_impl.dart:813]) (BuildId: 349b900323bc41a5af40333a09cbd634)
(Future._complete [future_impl.dart:575]) (BuildId: 349b900323bc41a5af40333a09cbd634)
(_SyncCompleter.complete [future_impl.dart:47]) (BuildId: 349b900323bc41a5af40333a09cbd634)
(_futurize.<anonymous closure> [painting.dart:6632]) (BuildId: 349b900323bc41a5af40333a09cbd634)
(_Image.toByteData.<anonymous closure>.<anonymous closure> [painting.dart:1959]) (BuildId: 349b900323bc41a5af40333a09cbd634)

@DavBfr Could you please check?