Fixed file sending to SD card

Closes #709

CHANGELOG.md

@@ -90,6 +90,7 @@
   side effects
 * [#680](https://github.com/foosel/OctoPrint/issues/680) - Don't accidentally include a newline from the MIME headers
   in the parsed multipart data from file uploads
+* [#709](https://github.com/foosel/OctoPrint/issues/709) - Properly initialize time estimation for SD card transfers too
 * Various fixes of bugs in newly introduced features and improvements:
   * [#625](https://github.com/foosel/OctoPrint/pull/625) - Newly added GCODE files were not being added to the analysis
     queue

src/octoprint/printer/__init__.py

@@ -383,7 +383,7 @@ class Printer():
 		self._stateMonitor.addMessage(message)
 
 	def _estimateTotalPrintTime(self, progress, printTime):
-		if not progress or not printTime:
+		if not progress or not printTime or not self._timeEstimationData:
 			#self._estimationLogger.info("{progress};{printTime};;;;".format(**locals()))
 			return None
 
@@ -679,6 +679,7 @@ class Printer():
 		existingSdFiles = map(lambda x: x[0], self._comm.getSdFiles())
 
 		remoteName = util.getDosFilename(filename, existingSdFiles)
+		self._timeEstimationData = TimeEstimationHelper()
 		self._comm.startFileTransfer(absolutePath, filename, remoteName)
 
 		return remoteName