Fix null when executing SQL in SQLFileOutputDialog

[leehaut]

Fix:

• This fix ensures proper initialization of the SqlFile object by setting its default values
• findDatabase() expects a database connection name, not a transform name.

java.lang.NullPointerException: Cannot invoke "org.apache.hop.pipeline.transforms.sqlfileoutput.SQLFileOutputMeta$SqlFile.setCreateParentFolder(boolean)" because the return value of "org.apache.hop.pipeline.transforms.sqlfileoutput.SQLFileOutputMeta.getFile()" is null
	at org.apache.hop.pipeline.transforms.sqlfileoutput.SQLFileOutputDialog.getInfo(SQLFileOutputDialog.java:830)
	at org.apache.hop.pipeline.transforms.sqlfileoutput.SQLFileOutputDialog.sql(SQLFileOutputDialog.java:901)
	at org.apache.hop.pipeline.transforms.sqlfileoutput.SQLFileOutputDialog.lambda$open$1(SQLFileOutputDialog.java:123)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:91)
	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4364)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1217)
	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4162)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3750)
	at org.apache.hop.ui.core.dialog.BaseDialog.defaultShellHandling(BaseDialog.java:800)
	at org.apache.hop.ui.core.dialog.BaseDialog.defaultShellHandling(BaseDialog.java:751)
	at org.apache.hop.pipeline.transforms.sqlfileoutput.SQLFileOutputDialog.open(SQLFileOutputDialog.java:744)
	at org.apache.hop.ui.hopgui.file.pipeline.delegates.HopGuiPipelineTransformDelegate.editTransform(HopGuiPipelineTransformDelegate.java:195)
	at org.apache.hop.ui.hopgui.file.pipeline.HopGuiPipelineGraph.editTransform(HopGuiPipelineGraph.java:3742)
	at org.apache.hop.ui.hopgui.file.pipeline.HopGuiPipelineGraph.mouseUp(HopGuiPipelineGraph.java:1063)
	at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:262)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:91)
	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4364)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1217)
	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4162)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3750)
	at org.apache.hop.ui.hopgui.HopGui.open(HopGui.java:573)
	at org.apache.hop.ui.hopgui.HopGui.main(HopGui.java:431)