fix: proper behavior for nonexistent files

Also skip the directory scan because it'd be slow and is generally unnecessary.

Author: isc-tleavitt

cls/SourceControl/Git/Utils.cls

@@ -635,12 +635,12 @@ ClassMethod ExternalName(InternalName As %String, ByRef MappingExists As %Boolea
     set file = $Replace(..Name(.InternalName,.MappingExists),"/",..#Slash)
     set fullFile = root_file
     if '..Exists(.fullFile) {
-        quit ""
+        quit file
     }
     quit $Piece(fullFile,root,2,*)
 }
 
-/// Check if file exists but case insensitive
+/// Check if file exists but case insensitive on file extension
 /// Stolen from %IPM.Utils.File
 ClassMethod Exists(ByRef pFilename) As %Boolean
 {
@@ -660,15 +660,6 @@ ClassMethod Exists(ByRef pFilename) As %Boolean
 			Return 1
 		}
 	}
-	set tNameLower = $$$LOWER(tName)
-	Set rs = ##class(%File).FileSetFunc(tDirectory, "*", , 0)
-	While rs.%Next() {
-		set tItemNameLower = $$$LOWER(rs.ItemName)
-		If tItemNameLower = tNameLower {
-			Set pFilename = tDirectory _ rs.ItemName
-			Return 1
-		}
-	}
 	Return 0
 }
 
@@ -2731,3 +2722,4 @@ ClassMethod BaselineExport(pCommitMessage = "", pPushToRemote = "") As %Status
 }
 
 }
+