Warn but continue if error buffer is too small

src/ksvd_update.jl

@@ -136,6 +136,13 @@ end
 function compute_E_Ω!(::ThreadedKSVDMethodPrecomp{true}, E_Ω_buf, E, Y, D, X, xₖ, ωₖ, k, timer=TimerOutput())
     @timeit_debug timer "compute E_Ω" begin
 
+    if size(E_Ω_buf, 2) <= length(ωₖ)
+        @warn """
+        The preallocated error buffer is too small. Not all errors will be computed. This is probably because
+        `maybe_init_buffer!` has been called with a ratio_nonzero that's too small. Try setting it to `1`.
+        """
+        ωₖ = ωₖ[1:size(E_Ω_buf, 2)]
+    end
     E_Ω = @view E_Ω_buf[:, 1:length(ωₖ)]
 
     @timeit_debug timer "copy" begin
@@ -152,6 +159,13 @@ end
 function compute_E_Ω!(::ThreadedKSVDMethodPrecomp{false}, E_Ω_buf, E, Y, D, X, xₖ, ωₖ, k, timer=TimerOutput())
     @timeit_debug timer "compute E_Ω" begin
 
+    if size(E_Ω_buf, 2) <= length(ωₖ)
+        @warn """
+        The preallocated error buffer is too small. Not all errors will be computed. This is probably because
+        `maybe_init_buffer!` has been called with a ratio_nonzero that's too small. Try setting it to `1`.
+        """
+        ωₖ = ωₖ[1:size(E_Ω_buf, 2)]
+    end
     E_Ω = @view E_Ω_buf[:, 1:length(ωₖ)]
 
     ##<BEGIN OPTIMIZED BLOCK>