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Fix crash when EMM emitted non-string errors (#638) #1091

Job	Run time
signin-sample-spm-build	1m 53s
signin-sample-pods-build	2m 13s
pod-lib-lint (macos-15, GoogleSignIn.podspec, --use-static-frameworks)	6m 45s
xcode-27-preview-test (macosx)	1m 51s
pod-lib-lint (macos-15, GoogleSignInSwiftSupport.podspec, --use-static-frameworks)	15m 36s
spm-build-test (macos-15, macosx)	2m 30s
pod-lib-lint (macos-15, GoogleSignIn.podspec)	14m 30s
spm-build-test (macos-15, iphonesimulator)	4m 21s
xcode-27-preview-test (iphonesimulator)	5m 0s
pod-lib-lint (macos-15, GoogleSignInSwiftSupport.podspec)	10m 20s
	1h 4m 59s