more clean ups.

added error cases to most vi.

ImageSource.lvproj

@@ -38,6 +38,7 @@
 				<Item Name="IMAQ Write PNG File 2" Type="VI" URL="/&lt;vilib&gt;/vision/Files.llb/IMAQ Write PNG File 2"/>
 				<Item Name="IMAQ Write TIFF File 2" Type="VI" URL="/&lt;vilib&gt;/vision/Files.llb/IMAQ Write TIFF File 2"/>
 				<Item Name="IMAQdx.ctl" Type="VI" URL="/&lt;vilib&gt;/userdefined/High Color/IMAQdx.ctl"/>
+				<Item Name="Is Path and Not Empty.vi" Type="VI" URL="/&lt;vilib&gt;/Utility/file.llb/Is Path and Not Empty.vi"/>
 				<Item Name="LVMinMaxIncTypeDef.ctl" Type="VI" URL="/&lt;vilib&gt;/Utility/miscctls.llb/LVMinMaxIncTypeDef.ctl"/>
 				<Item Name="NI_AALBase.lvlib" Type="Library" URL="/&lt;vilib&gt;/Analysis/NI_AALBase.lvlib"/>
 				<Item Name="NI_FileType.lvlib" Type="Library" URL="/&lt;vilib&gt;/Utility/lvfile.llb/NI_FileType.lvlib"/>