Don’t try to create auto import provider when host program doesn’t exist (microsoft#45126)

* Guard against creating auto import provider without host program

* Also don’t pre-seed auto import provider if updateGraph didn’t produce a program

* Rename `isFirstLoad`

Author: andrewbranch

src/server/project.ts

@@ -1070,15 +1070,15 @@ namespace ts.server {
                 this.lastCachedUnresolvedImportsList = undefined;
             }
 
-            const isFirstLoad = this.projectProgramVersion === 0;
+            const isFirstProgramLoad = this.projectProgramVersion === 0 && hasNewProgram;
             if (hasNewProgram) {
                 this.projectProgramVersion++;
             }
             if (hasAddedorRemovedFiles) {
                 if (!this.autoImportProviderHost) this.autoImportProviderHost = undefined;
                 this.autoImportProviderHost?.markAsDirty();
             }
-            if (isFirstLoad) {
+            if (isFirstProgramLoad) {
                 // Preload auto import provider so it's not created during completions request
                 this.getPackageJsonAutoImportProvider();
             }
@@ -1902,6 +1902,11 @@ namespace ts.server {
                 return ts.emptyArray;
             }
 
+            const program = hostProject.getCurrentProgram();
+            if (!program) {
+                return ts.emptyArray;
+            }
+
             let dependencyNames: Set<string> | undefined;
             let rootNames: string[] | undefined;
             const rootFileName = combinePaths(hostProject.currentDirectory, inferredTypesContainingFile);
@@ -1918,7 +1923,6 @@ namespace ts.server {
                     compilerOptions,
                     moduleResolutionHost));
 
-                const program = hostProject.getCurrentProgram()!;
                 const symlinkCache = hostProject.getSymlinkCache();
                 for (const resolution of resolutions) {
                     if (!resolution.resolvedTypeReferenceDirective?.resolvedFileName) continue;