Fix error when reading file using an unsatisifable range

Author: SailReal

src/main/java/org/cryptomator/cloudaccess/api/CloudProvider.java

@@ -102,7 +102,7 @@ default CompletionStage<InputStream> read(CloudPath file, ProgressListener progr
 	 * @param offset           The first byte (inclusive) to read.
 	 * @param count            The number of bytes requested. Can exceed the actual file length. Set to {@link Long#MAX_VALUE} to read till EOF.
 	 * @param progressListener TODO Future use
-	 * @return CompletionStage with an InputStream to read from. If accessing the file fails, it'll complete exceptionally.
+	 * @return CompletionStage with an InputStream to read from. If accessing the file fails, it'll complete exceptionally. If the requested range cannot be fulfilled, an inputstream with 0 bytes is returned
 	 */
 	CompletionStage<InputStream> read(CloudPath file, long offset, long count, ProgressListener progressListener);
 

src/main/java/org/cryptomator/cloudaccess/webdav/WebDavClient.java

@@ -153,6 +153,13 @@ private InputStream read(final Request.Builder getRequest, final ProgressListene
 		try {
 			response = httpClient.execute(getRequest);
 			final var countingBody = new ProgressResponseWrapper(response.body(), progressListener);
+
+			final int UNSATISFIABLE_RANGE = 416;
+			 if(response.code() == UNSATISFIABLE_RANGE) {
+				success = true;
+				return new ByteArrayInputStream(new byte[0]);
+			}
+
 			checkExecutionSucceeded(response.code());
 			success = true;
 			return countingBody.byteStream();